Vulnerabilities > CVE-2017-11914 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Chakracore and Edge
Attack vector
NETWORK Attack complexity
HIGH Privileges required
NONE Confidentiality impact
COMPLETE Integrity impact
COMPLETE Availability impact
COMPLETE Summary
ChakraCore and Microsoft Edge in Windows 10 1511, 1607, 1703, 1709, and Windows Server 2016 allows an attacker to gain the same user rights as the current user, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-11886, CVE-2017-11889, CVE-2017-11890, CVE-2017-11893, CVE-2017-11894, CVE-2017-11895, CVE-2017-11901, CVE-2017-11903, CVE-2017-11905, CVE-2017-11905, CVE-2017-11907, CVE-2017-11908, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11912, CVE-2017-11913, CVE-2017-11916, CVE-2017-11918, and CVE-2017-11930.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Exploit-Db
| description | Microsoft Edge Chakra - 'JavascriptGeneratorFunction::GetPropertyBuiltIns' Type Confusion. CVE-2017-11914. Dos exploit for Windows platform. Tags: Type Confu... |
| file | exploits/windows/dos/43713.js |
| id | EDB-ID:43713 |
| last seen | 2018-01-24 |
| modified | 2018-01-17 |
| platform | windows |
| port | |
| published | 2018-01-17 |
| reporter | Exploit-DB |
| source | https://www.exploit-db.com/download/43713/ |
| title | Microsoft Edge Chakra - 'JavascriptGeneratorFunction::GetPropertyBuiltIns' Type Confusion |
| type | dos |
Nessus
NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS17_DEC_4054517.NASL description The remote Windows host is missing security update 4054517. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11889, CVE-2017-11893, CVE-2017-11905, CVE-2017-11908, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11914, CVE-2017-11918) - A security feature bypass exists when Device Guard incorrectly validates an untrusted file. An attacker who successfully exploited this vulnerability could make an unsigned file appear to be signed. Because Device Guard relies on the signature to determine the file is non- malicious, Device Guard could then allow a malicious file to execute. In an attack scenario, an attacker could make an untrusted file appear to be a trusted file. The update addresses the vulnerability by correcting how Device Guard handles untrusted files. (CVE-2017-11899) - An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory in Microsoft browsers. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11919) - A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11888) - A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11886, CVE-2017-11890, CVE-2017-11901, CVE-2017-11903, CVE-2017-11907, CVE-2017-11913) - A remote code execution vulnerability exists in RPC if the server has Routing and Remote Access enabled. An attacker who successfully exploited this vulnerability could execute code on the target system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2017-11885) - A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11894, CVE-2017-11895, CVE-2017-11912, CVE-2017-11930) - An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11887, CVE-2017-11906) - An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site. (CVE-2017-11927) last seen 2020-06-01 modified 2020-06-02 plugin id 105183 published 2017-12-12 reporter This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105183 title KB4054517: Windows 10 Version 1709 and Windows Server Version 1709 December 2017 Security Update code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from the Microsoft Security Updates API. The text # itself is copyright (C) Microsoft Corporation. # include("compat.inc"); if (description) { script_id(105183); script_version("1.10"); script_cvs_date("Date: 2018/12/13 17:21:46"); script_cve_id( "CVE-2017-11885", "CVE-2017-11886", "CVE-2017-11887", "CVE-2017-11888", "CVE-2017-11889", "CVE-2017-11890", "CVE-2017-11893", "CVE-2017-11894", "CVE-2017-11895", "CVE-2017-11899", "CVE-2017-11901", "CVE-2017-11903", "CVE-2017-11905", "CVE-2017-11906", "CVE-2017-11907", "CVE-2017-11908", "CVE-2017-11909", "CVE-2017-11910", "CVE-2017-11911", "CVE-2017-11912", "CVE-2017-11913", "CVE-2017-11914", "CVE-2017-11918", "CVE-2017-11919", "CVE-2017-11927", "CVE-2017-11930" ); script_bugtraq_id( 102045, 102046, 102047, 102050, 102052, 102053, 102054, 102055, 102058, 102062, 102063, 102065, 102077, 102078, 102080, 102081, 102082, 102085, 102086, 102087, 102088, 102089, 102091, 102092, 102093, 102095 ); script_xref(name:"MSKB", value:"4054517"); script_xref(name:"MSFT", value:"MS17-4054517"); script_name(english:"KB4054517: Windows 10 Version 1709 and Windows Server Version 1709 December 2017 Security Update"); script_summary(english:"Checks for rollup."); script_set_attribute(attribute:"synopsis", value: "The remote Windows host is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "The remote Windows host is missing security update 4054517. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11889, CVE-2017-11893, CVE-2017-11905, CVE-2017-11908, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11914, CVE-2017-11918) - A security feature bypass exists when Device Guard incorrectly validates an untrusted file. An attacker who successfully exploited this vulnerability could make an unsigned file appear to be signed. Because Device Guard relies on the signature to determine the file is non- malicious, Device Guard could then allow a malicious file to execute. In an attack scenario, an attacker could make an untrusted file appear to be a trusted file. The update addresses the vulnerability by correcting how Device Guard handles untrusted files. (CVE-2017-11899) - An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory in Microsoft browsers. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11919) - A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11888) - A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11886, CVE-2017-11890, CVE-2017-11901, CVE-2017-11903, CVE-2017-11907, CVE-2017-11913) - A remote code execution vulnerability exists in RPC if the server has Routing and Remote Access enabled. An attacker who successfully exploited this vulnerability could execute code on the target system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2017-11885) - A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11894, CVE-2017-11895, CVE-2017-11912, CVE-2017-11930) - An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11887, CVE-2017-11906) - An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site. (CVE-2017-11927)"); # https://support.microsoft.com/en-us/help/4054517/windows-10-update-kb4054517 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3a819f12"); script_set_attribute(attribute:"solution", value: "Apply security update KB4054517."); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-11885"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"exploited_by_malware", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/12"); script_set_attribute(attribute:"patch_publication_date", value:"2017/12/12"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/12"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Windows : Microsoft Bulletins"); script_copyright(english:"This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("smb_check_rollup.nasl", "smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl"); script_require_keys("SMB/MS_Bulletin_Checks/Possible"); script_require_ports(139, 445, "Host/patch_management_checks"); exit(0); } include("audit.inc"); include("smb_hotfixes_fcheck.inc"); include("smb_hotfixes.inc"); include("smb_func.inc"); include("misc_func.inc"); get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible"); bulletin = "MS17-12"; kbs = make_list('4054517'); if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE); get_kb_item_or_exit("SMB/Registry/Enumerated"); get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1); if (hotfix_check_sp_range(win10:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN); share = hotfix_get_systemdrive(as_share:TRUE, exit_on_fail:TRUE); if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share); if ( smb_check_rollup(os:"10", sp:0, os_build:"16299", rollup_date:"12_2017", bulletin:bulletin, rollup_kb_list:[4054517]) ) { replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE); hotfix_security_hole(); hotfix_check_fversion_end(); exit(0); } else { hotfix_check_fversion_end(); audit(AUDIT_HOST_NOT, hotfix_get_audit_report()); }NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS17_DEC_4053580.NASL description The remote Windows host is missing security update 4053580. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11889, CVE-2017-11893, CVE-2017-11905, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11914, CVE-2017-11918) - A security feature bypass exists when Device Guard incorrectly validates an untrusted file. An attacker who successfully exploited this vulnerability could make an unsigned file appear to be signed. Because Device Guard relies on the signature to determine the file is non- malicious, Device Guard could then allow a malicious file to execute. In an attack scenario, an attacker could make an untrusted file appear to be a trusted file. The update addresses the vulnerability by correcting how Device Guard handles untrusted files. (CVE-2017-11899) - An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory in Microsoft browsers. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11919) - A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11888) - A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11886, CVE-2017-11890, CVE-2017-11901, CVE-2017-11903, CVE-2017-11907, CVE-2017-11913) - A remote code execution vulnerability exists in RPC if the server has Routing and Remote Access enabled. An attacker who successfully exploited this vulnerability could execute code on the target system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2017-11885) - A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11894, CVE-2017-11895, CVE-2017-11912, CVE-2017-11930) - An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11887, CVE-2017-11906) - An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site. (CVE-2017-11927) last seen 2020-06-01 modified 2020-06-02 plugin id 105181 published 2017-12-12 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105181 title KB4053580: Windows 10 Version 1703 December 2017 Security Update NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS17_DEC_4053578.NASL description The remote Windows host is missing security update 4053578. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11889, CVE-2017-11893, CVE-2017-11905, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11914, CVE-2017-11918) - A security feature bypass exists when Device Guard incorrectly validates an untrusted file. An attacker who successfully exploited this vulnerability could make an unsigned file appear to be signed. Because Device Guard relies on the signature to determine the file is non- malicious, Device Guard could then allow a malicious file to execute. In an attack scenario, an attacker could make an untrusted file appear to be a trusted file. The update addresses the vulnerability by correcting how Device Guard handles untrusted files. (CVE-2017-11899) - An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory in Microsoft browsers. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11919) - A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11888) - A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11886, CVE-2017-11890, CVE-2017-11901, CVE-2017-11903, CVE-2017-11907, CVE-2017-11913) - A remote code execution vulnerability exists in RPC if the server has Routing and Remote Access enabled. An attacker who successfully exploited this vulnerability could execute code on the target system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2017-11885) - A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11894, CVE-2017-11895, CVE-2017-11912, CVE-2017-11930) - An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11887, CVE-2017-11906) - An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site. (CVE-2017-11927) last seen 2020-06-01 modified 2020-06-02 plugin id 105179 published 2017-12-12 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105179 title KB4053578: Windows 10 Version 1511 December 2017 Security Update NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS17_DEC_4053579.NASL description The remote Windows host is missing security update 4053579. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11889, CVE-2017-11893, CVE-2017-11905, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11914, CVE-2017-11918) - A security feature bypass exists when Device Guard incorrectly validates an untrusted file. An attacker who successfully exploited this vulnerability could make an unsigned file appear to be signed. Because Device Guard relies on the signature to determine the file is non- malicious, Device Guard could then allow a malicious file to execute. In an attack scenario, an attacker could make an untrusted file appear to be a trusted file. The update addresses the vulnerability by correcting how Device Guard handles untrusted files. (CVE-2017-11899) - An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory in Microsoft browsers. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11919) - A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11888) - A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11886, CVE-2017-11890, CVE-2017-11901, CVE-2017-11903, CVE-2017-11907, CVE-2017-11913) - A remote code execution vulnerability exists in RPC if the server has Routing and Remote Access enabled. An attacker who successfully exploited this vulnerability could execute code on the target system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2017-11885) - A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. (CVE-2017-11894, CVE-2017-11895, CVE-2017-11912, CVE-2017-11930) - An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the users system. (CVE-2017-11887, CVE-2017-11906) - An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site. (CVE-2017-11927) last seen 2020-06-01 modified 2020-06-02 plugin id 105180 published 2017-12-12 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105180 title KB4053579: Windows 10 Version 1607 and Windows Server 2016 December 2017 Security Update
Packetstorm
| data source | https://packetstormsecurity.com/files/download/145950/GS20180118040348.txt |
| id | PACKETSTORM:145950 |
| last seen | 2018-01-18 |
| published | 2018-01-17 |
| reporter | Google Security Research |
| source | https://packetstormsecurity.com/files/145950/Microsoft-Edge-Chakra-JavascriptGeneratorFunction-GetPropertyBuiltIns-Exposure.html |
| title | Microsoft Edge Chakra JavascriptGeneratorFunction::GetPropertyBuiltIns Exposure |
Seebug
| bulletinFamily | exploit |
| description | Here's a snippet of the method. ``` bool JavascriptGeneratorFunction::GetPropertyBuiltIns(Var originalInstance, PropertyId propertyId, Var* value, PropertyValueInfo* info, ScriptContext* requestContext, BOOL* result) { if (propertyId == PropertyIds::length) { ... int len = 0; Var varLength; if (scriptFunction->GetProperty(scriptFunction, PropertyIds::length, &varLength, NULL, requestContext)) { len = JavascriptConversion::ToInt32(varLength, requestContext); } ... return true; } return false; } ``` "JavascriptGeneratorFunction" is like a wrapper class used to ensure the arguments for "scriptFunction". So "scriptFunction" must not be exposed to user JavaScript code. But the vulnerable method exposes "scriptFunction" as "this" when getting the "length" property. The code should be like: "scriptFunction->GetProperty(this, PropertyIds::length, &varLength, NULL, requestContext);" ``` Type confusion PoC: function* f() { } let g; f.__defineGetter__('length', function () { g = this; // g == "scriptFunction" }); f.length; g.call(0x1234, 0x5678); // type confusion ``` |
| id | SSV:97094 |
| last seen | 2018-01-22 |
| modified | 2018-01-22 |
| published | 2018-01-22 |
| reporter | Root |
| title | Microsoft Edge: Chakra: JavascriptGeneratorFunction::GetPropertyBuiltIns exposes scriptFunction(CVE-2017-11914) |