Vulnerabilities > CVE-2017-13867 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Apple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
An issue was discovered in certain Apple products. iOS before 11.2 is affected. macOS before 10.13.2 is affected. tvOS before 11.2 is affected. watchOS before 4.2 is affected. The issue involves the "Kernel" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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 | macOS/iOS - Kernel Double Free due to Incorrect API Usage in Flow Divert Socket Option Handling. CVE-2017-13867. Dos exploit for Multiple platform |
file | exploits/multiple/dos/43328.c |
id | EDB-ID:43328 |
last seen | 2017-12-12 |
modified | 2017-12-12 |
platform | multiple |
port | |
published | 2017-12-12 |
reporter | Exploit-DB |
source | https://www.exploit-db.com/download/43328/ |
title | macOS/iOS - Kernel Double Free due to Incorrect API Usage in Flow Divert Socket Option Handling |
type | dos |
Nessus
NASL family MacOS X Local Security Checks NASL id MACOS_10_13_2.NASL description The remote host is running a version of Mac OS X that is 10.13.x prior to 10.13.2. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - curl - Directory Utility - IOAcceleratorFamily - IOKit - Intel Graphics Driver - Kernel - Mail - Mail Drafts - OpenSSL - Screen Sharing Server Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 105080 published 2017-12-07 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/105080 title macOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(105080); script_version("1.12"); script_cvs_date("Date: 2019/06/19 15:17:43"); script_cve_id( "CVE-2017-1000254", "CVE-2017-13847", "CVE-2017-13848", "CVE-2017-13855", "CVE-2017-13858", "CVE-2017-13860", "CVE-2017-13862", "CVE-2017-13865", "CVE-2017-13867", "CVE-2017-13868", "CVE-2017-13869", "CVE-2017-13871", "CVE-2017-13872", "CVE-2017-13875", "CVE-2017-13876", "CVE-2017-13878", "CVE-2017-13883", "CVE-2017-13886", "CVE-2017-13887", "CVE-2017-13892", "CVE-2017-13904", "CVE-2017-13905", "CVE-2017-13911", "CVE-2017-15422", "CVE-2017-3735", "CVE-2017-5754", "CVE-2017-7151", "CVE-2017-7154", "CVE-2017-7155", "CVE-2017-7158", "CVE-2017-7159", "CVE-2017-7162", "CVE-2017-7163", "CVE-2017-7171", "CVE-2017-7172", "CVE-2017-7173", "CVE-2017-9798" ); script_bugtraq_id( 100515, 100872, 101115, 101981, 102097, 102098, 102099, 102100, 102378, 103134, 103135 ); script_xref(name:"IAVA", value:"2018-A-0019"); script_name(english:"macOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown)"); script_summary(english:"Checks the version of Mac OS X / macOS."); script_set_attribute(attribute:"synopsis", value: "The remote host is missing a macOS update that fixes multiple security vulnerabilities."); script_set_attribute(attribute:"description", value: "The remote host is running a version of Mac OS X that is 10.13.x prior to 10.13.2. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - curl - Directory Utility - IOAcceleratorFamily - IOKit - Intel Graphics Driver - Kernel - Mail - Mail Drafts - OpenSSL - Screen Sharing Server Note that successful exploitation of the most serious issues can result in arbitrary code execution."); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208331"); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT208394"); script_set_attribute(attribute:"solution", value: "Upgrade to macOS version 10.13.2 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/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:L/AC:L/PR:N/UI:R/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-2017-7172"); 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:"metasploit_name", value:'Mac OS X Root Privilege Escalation'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/06"); script_set_attribute(attribute:"patch_publication_date", value:"2017/12/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/07"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x"); script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:macos"); script_set_attribute(attribute:"stig_severity", value:"I"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"MacOS X Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl", "os_fingerprint.nasl"); script_require_ports("Host/MacOSX/Version", "Host/OS"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); os = get_kb_item("Host/MacOSX/Version"); if (!os) { os = get_kb_item_or_exit("Host/OS"); if ("Mac OS X" >!< os) audit(AUDIT_OS_NOT, "macOS / Mac OS X"); c = get_kb_item("Host/OS/Confidence"); if (c <= 70) exit(1, "Can't determine the host's OS with sufficient confidence."); } if (!os) audit(AUDIT_OS_NOT, "macOS / Mac OS X"); matches = pregmatch(pattern:"Mac OS X ([0-9]+(\.[0-9]+)+)", string:os); if (empty_or_null(matches)) exit(1, "Failed to parse the macOS / Mac OS X version ('" + os + "')."); version = matches[1]; fixed_version = "10.13.2"; if (version !~"^10\.13($|[^0-9])") audit(AUDIT_OS_NOT, "macOS 10.13.x"); if (ver_compare(ver:version, fix:'10.13.2', strict:FALSE) == -1) { security_report_v4( port:0, severity:SECURITY_HOLE, extra: '\n Installed version : ' + version + '\n Fixed version : ' + fixed_version + '\n' ); } else audit(AUDIT_INST_VER_NOT_VULN, "macOS / Mac OS X", version);
NASL family Misc. NASL id APPLETV_11_2.NASL description According to its banner, the version of Apple TV on the remote device is prior to 11.2. It is, therefore, affected by multiple vulnerabilities as described in the HT208327 security advisory. Note that only 4th and 5th generation models are affected by these vulnerabilities. last seen 2020-06-01 modified 2020-06-02 plugin id 105612 published 2018-01-05 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105612 title Apple TV < 11.2 Multiple Vulnerabilities NASL family MacOS X Local Security Checks NASL id MACOSX_SECUPD2017-005.NASL description The remote host is running Mac OS X 10.11.6 or Mac OS X 10.12.6 and is missing a security update. It is therefore, affected by multiple vulnerabilities affecting the following components : - apache - curl - IOAcceleratorFamily - IOKit - Kernel - OpenSSL - Screen Sharing Server last seen 2020-06-01 modified 2020-06-02 plugin id 105081 published 2017-12-07 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/105081 title macOS and Mac OS X Multiple Vulnerabilities (Security Update 2017-002 and 2017-005)
Seebug
bulletinFamily | exploit |
description | SO_FLOW_DIVERT_TOKEN is a socket option on the `SOL_SOCKET`layer. It's implemented by ``` flow_divert_token_set(struct socket *so, struct sockopt *sopt) in flow_divert.c. The relevant code is: error = soopt_getm(sopt, &token); if (error) { goto done; } error = soopt_mcopyin(sopt, token); if (error) { goto done; } ... done: if (token != NULL) { mbuf_freem(token); } ``` `soopt_getm` allocates an mbuf. `soopt_mcopyin`, which should copyin the data for the mbuf from userspace, has the following code: ``` error = copyin(sopt->sopt_val, mtod(m, char *), m->m_len); if (error != 0) { m_freem(m0); return (error); } ``` This means that if the copyin fails, by for example providing an invalid userspace pointer, soopt_mcopyin will free the mbuf. `flow_divert_token_set` isn't aware of these semantics and if it sees that soopt_mcopyin returns an error it also calls mbuf_freem on that same mbuf which `soopy_mcopyin` already freed. mbufs are aggressivly cached but with sufficiently full caches m_freem will eventually fall through to freeing back to a zalloc zone, and that zone could potentially be garbage collected leading to the ability to actually exploit such an issue. This PoC will just hit a panic inside m_free when it detects a double-free but do note that this cannot detect all double frees and this issue is still exploitable with sufficient grooming/cache manipulation. Tested on MacOS 10.13 (17A365) on MacBookAir5,2 |
id | SSV:96986 |
last seen | 2017-12-25 |
modified | 2017-12-15 |
published | 2017-12-15 |
reporter | Root |
source | https://www.seebug.org/vuldb/ssvid-96986 |
title | MacOS/iOS kernel double free due to incorrect API usage in flow divert socket option handling(CVE-2017-13867) |
References
- http://www.securityfocus.com/bid/102100
- http://www.securityfocus.com/bid/102100
- http://www.securitytracker.com/id/1039952
- http://www.securitytracker.com/id/1039952
- http://www.securitytracker.com/id/1039953
- http://www.securitytracker.com/id/1039953
- http://www.securitytracker.com/id/1039966
- http://www.securitytracker.com/id/1039966
- https://support.apple.com/HT208325
- https://support.apple.com/HT208325
- https://support.apple.com/HT208327
- https://support.apple.com/HT208327
- https://support.apple.com/HT208331
- https://support.apple.com/HT208331
- https://support.apple.com/HT208334
- https://support.apple.com/HT208334
- https://www.exploit-db.com/exploits/43328/
- https://www.exploit-db.com/exploits/43328/