Vulnerabilities > CVE-2019-1204 - Improper Input Validation vulnerability in Microsoft Office, Office 365 Proplus and Outlook
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
LOW Integrity impact
NONE Availability impact
NONE Summary
An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). To exploit the vulnerability, the attacker could send a specially crafted email to a victim. Outlook would then attempt to open a pre-configured message store contained in the email upon receipt of the email. This update addresses the vulnerability by ensuring Office fully validates incoming email formatting before processing message content.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 6 |
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.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS19_AUG_OUTLOOK.NASL description The Microsoft Outlook application installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in Microsoft Outlook software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. (CVE-2019-1200) - An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). (CVE-2019-1204) last seen 2020-06-01 modified 2020-06-02 plugin id 127854 published 2019-08-13 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/127854 title Security Updates for Outlook (August 2019) 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(127854); script_version("1.6"); script_cvs_date("Date: 2020/02/14"); script_cve_id("CVE-2019-1200", "CVE-2019-1204"); script_xref(name:"MSKB", value:"4475553"); script_xref(name:"MSKB", value:"4475573"); script_xref(name:"MSKB", value:"4475563"); script_xref(name:"MSFT", value:"MS19-4475553"); script_xref(name:"MSFT", value:"MS19-4475573"); script_xref(name:"MSFT", value:"MS19-4475563"); script_name(english:"Security Updates for Outlook (August 2019)"); script_summary(english:"Checks for Microsoft security updates."); script_set_attribute(attribute:"synopsis", value: "The Microsoft Outlook application installed on the remote host is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "The Microsoft Outlook application installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in Microsoft Outlook software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. (CVE-2019-1200) - An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). (CVE-2019-1204)"); # https://support.microsoft.com/en-us/help/4475553/security-update-for-outlook-2016-august-13-2019 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?647e8bbb"); # https://support.microsoft.com/en-us/help/4475573/security-update-for-outlook-2010-august-13-2019 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f23a14c8"); # https://support.microsoft.com/en-us/help/4475563/security-update-for-outlook-2013-august-13-2019 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?82efb58e"); script_set_attribute(attribute:"solution", value: "Microsoft has released the following security updates to address this issue: -KB4475553 -KB4475573 -KB4475563"); 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:U/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:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-1200"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/08/13"); script_set_attribute(attribute:"patch_publication_date", value:"2019/08/13"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/13"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:outlook"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Windows : Microsoft Bulletins"); script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("office_installed.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_func.inc"); include("smb_hotfixes.inc"); include("smb_hotfixes_fcheck.inc"); include("smb_reg_query.inc"); include("install_func.inc"); get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible"); bulletin = "MS19-08"; kbs = make_list( 4475553, 4475573, 4475563 ); 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", exit_code:1); port = kb_smb_transport(); checks = make_array( "14.0", make_array("sp", 2, "version", "14.0.7236.5000", "kb", "4475573"), "15.0", make_array("sp", 1, "version", "15.0.5163.1000", "kb", "4475563"), "16.0", make_nested_list(make_array("sp", 0, "version", "16.0.4888.1000", "channel", "MSI", "kb", "4475553"), # C2R make_array("version", "16.0.9126.2432", "channel", "Deferred"), make_array("version", "16.0.10730.20370", "channel", "Deferred", "channel_version", "1808"), make_array("version", "16.0.11328.20392", "channel", "Deferred", "channel_version", "1902"), make_array("version", "16.0.11328.20392", "channel", "First Release for Deferred"), make_array("version", "16.0.11901.20218", "channel", "Current"), # 2019 make_array("version", "16.0.11901.20218", "channel", "2019 Retail"), make_array("version", "16.0.10349.20017", "channel", "2019 Volume")) ); if (hotfix_check_office_product(product:"Outlook", checks:checks, bulletin:bulletin)) { 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, 'affected'); }NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS19_AUG_OFFICE.NASL description The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities : - A remote code execution vulnerability exists in Microsoft Outlook software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. (CVE-2019-1200) - A remote code execution vulnerability exists in Microsoft Outlook when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2019-1199) - An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). (CVE-2019-1204) - A remote code execution vulnerability exists in Microsoft Word software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. (CVE-2019-1201, CVE-2019-1205) - A remote code execution vulnerability exists when the Windows Jet Database Engine improperly handles objects in memory. An attacker who successfully exploited this vulnerability could execute arbitrary code on a victim system. An attacker could exploit this vulnerability by enticing a victim to open a specially crafted file. The update addresses the vulnerability by correcting the way the Windows Jet Database Engine handles objects in memory. (CVE-2019-1155) last seen 2020-06-01 modified 2020-06-02 plugin id 127853 published 2019-08-13 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/127853 title Security Updates for Microsoft Office Products (August 2019)