Vulnerabilities > CVE-2012-2543 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Microsoft products
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
COMPLETE Integrity impact
COMPLETE Availability impact
COMPLETE Summary
Stack-based buffer overflow in Microsoft Excel 2007 SP2 and SP3 and 2010 SP1; Office 2011 for Mac; Excel Viewer; and Office Compatibility Pack SP2 and SP3 allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Stack Overflow Vulnerability."
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 8 |
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.
Msbulletin
bulletin_id | MS12-076 |
bulletin_url | |
date | 2012-11-13T00:00:00 |
impact | Remote Code Execution |
knowledgebase_id | 2720184 |
knowledgebase_url | |
severity | Important |
title | Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution |
Nessus
NASL family MacOS X Local Security Checks NASL id MACOSX_MS12-076.NASL description The remote Mac OS X host is running a version of Microsoft Excel that is affected by the following vulnerabilities : - A heap-based buffer overflow vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1885) - A memory corruption vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1886) - A use-after-free vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1887) - A stack-based buffer overflow vulnerability exists due to the way the application handles data structures while parsing Excel files. (CVE-2012-2543) If an attacker can trick a user on the affected host into opening a specially crafted Excel file, it may be possible to leverage these issues to execute arbitrary code subject to the user last seen 2019-10-28 modified 2012-11-14 plugin id 62909 published 2012-11-14 reporter This script is Copyright (C) 2012-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/62909 title MS12-076: Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2720184) (Mac OS X) code #TRUSTED 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 # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(62909); script_version("1.13"); script_set_attribute(attribute:"plugin_modification_date", value:"2018/07/14"); script_cve_id( "CVE-2012-1885", "CVE-2012-1886", "CVE-2012-1887", "CVE-2012-2543" ); script_bugtraq_id(56425, 56426, 56430, 56431); script_xref(name:"MSFT", value:"MS12-076"); script_xref(name:"MSKB", value:"2764047"); script_xref(name:"MSKB", value:"2764048"); script_name(english:"MS12-076: Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2720184) (Mac OS X)"); script_summary(english:"Check version of Microsoft Office"); script_set_attribute(attribute:"synopsis", value: "An application installed on the remote Mac OS X host is affected by multiple remote code execution vulnerabilities."); script_set_attribute(attribute:"description", value: "The remote Mac OS X host is running a version of Microsoft Excel that is affected by the following vulnerabilities : - A heap-based buffer overflow vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1885) - A memory corruption vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1886) - A use-after-free vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1887) - A stack-based buffer overflow vulnerability exists due to the way the application handles data structures while parsing Excel files. (CVE-2012-2543) If an attacker can trick a user on the affected host into opening a specially crafted Excel file, it may be possible to leverage these issues to execute arbitrary code subject to the user's privileges."); script_set_attribute(attribute:"see_also", value:"http://technet.microsoft.com/en-us/security/bulletin/ms12-076"); script_set_attribute(attribute:"solution", value: "Microsoft has released a set of patches for Office for Mac 2011 and Office 2008 for Mac."); 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_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:"2012/11/13"); script_set_attribute(attribute:"patch_publication_date", value:"2012/11/13"); script_set_attribute(attribute:"plugin_publication_date", value:"2012/11/14"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office:2008::mac"); script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office:2011::mac"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"MacOS X Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2012-2018 Tenable Network Security, Inc."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/MacOSX/Version"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); include("ssh_func.inc"); include("macosx_func.inc"); if(sshlib::get_support_level() >= sshlib::SSH_LIB_SUPPORTS_COMMANDS) enable_ssh_wrappers(); else disable_ssh_wrappers(); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); os = get_kb_item("Host/MacOSX/Version"); if (!os) audit(AUDIT_OS_NOT, "Mac OS X"); # Gather version info. info = ''; installs = make_array(); prod = 'Office for Mac 2011'; path = '/Applications/Microsoft Office 2011'; plist = path + '/Office/MicrosoftComponentPlugin.framework/Versions/14/Resources/Info.plist'; cmd = 'cat \'' + plist + '\' | ' + 'grep -A 1 CFBundleShortVersionString | ' + 'tail -n 1 | ' + 'sed \'s/.*string>\\(.*\\)<\\/string>.*/\\1/g\''; version = exec_cmd(cmd:cmd); if (version && version =~ "^[0-9]+\.") { version = chomp(version); if (version !~ "^14\.") exit(1, "Failed to get the version for "+prod+" - '"+version+"'."); installs[prod] = version; fixed_version = '14.2.5'; if (ver_compare(ver:version, fix:fixed_version, strict:FALSE) == -1) { info += '\n Product : ' + prod + '\n Path : ' + path + '\n Installed version : ' + version + '\n Fixed version : ' + fixed_version + '\n'; } } prod = 'Office 2008 for Mac'; path = '/Applications/Microsoft Office 2008'; plist = path + '/Office/MicrosoftComponentPlugin.framework/Versions/12/Resources/Info.plist'; cmd = 'cat \'' + plist + '\' | ' + 'grep -A 1 CFBundleShortVersionString | ' + 'tail -n 1 | ' + 'sed \'s/.*string>\\(.*\\)<\\/string>.*/\\1/g\''; version = exec_cmd(cmd:cmd); if (version && version =~ "^[0-9]+\.") { version = chomp(version); if (version !~ "^12\.") exit(1, "Failed to get the version for "+prod+" - '"+version+"'."); installs[prod] = version; fixed_version = '12.3.5'; if (ver_compare(ver:version, fix:fixed_version, strict:FALSE) == -1) { info += '\n Product : ' + prod + '\n Path : ' + path + '\n Installed version : ' + version + '\n Fixed version : ' + fixed_version + '\n'; } } # Report findings. if (info) { if (report_verbosity > 0) security_hole(port:0, extra:info); else security_hole(0); exit(0); } else { if (max_index(keys(installs)) == 0) exit(0, "Office 2008 for Mac / Office for Mac 2011 is not installed."); else { msg = 'The host has '; foreach prod (sort(keys(installs))) msg += prod + ' ' + installs[prod] + ' and '; msg = substr(msg, 0, strlen(msg)-1-strlen(' and ')); msg += ' installed and thus is not affected.'; exit(0, msg); } }
NASL family Windows : Microsoft Bulletins NASL id SMB_NT_MS12-076.NASL description The remote Windows host is running a version of Microsoft Excel that is affected by the following vulnerabilities : - A heap-based buffer overflow vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1885) - A memory corruption vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1886) - A use-after-free vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1887) - A stack-based buffer overflow vulnerability exists due to the way the application handles data structures while parsing Excel files. (CVE-2012-2543) If an attacker can trick a user on the affected host into opening a specially crafted Excel file, it may be possible to leverage these issues to execute arbitrary code subject to the user last seen 2020-06-01 modified 2020-06-02 plugin id 62908 published 2012-11-14 reporter This script is Copyright (C) 2012-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/62908 title MS12-076: Vulnerabilities in Microsoft Office Could Allow Remote Code Execution (2720184) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(62908); script_version("1.21"); script_cvs_date("Date: 2018/11/15 20:50:31"); script_cve_id( "CVE-2012-1885", "CVE-2012-1886", "CVE-2012-1887", "CVE-2012-2543" ); script_bugtraq_id(56425, 56426, 56430, 56431); script_xref(name:"MSFT", value:"MS12-076"); script_xref(name:"MSKB", value:"2597126"); script_xref(name:"MSKB", value:"2687307"); script_xref(name:"MSKB", value:"2687311"); script_xref(name:"MSKB", value:"2687313"); script_xref(name:"MSKB", value:"2687481"); script_name(english:"MS12-076: Vulnerabilities in Microsoft Office Could Allow Remote Code Execution (2720184)"); script_summary(english:"Checks versions of Excel, Excelcnv.exe, and Xlview.exe."); script_set_attribute(attribute:"synopsis", value: "It is possible to execute arbitrary code on the remote host through Microsoft Excel."); script_set_attribute(attribute:"description", value: "The remote Windows host is running a version of Microsoft Excel that is affected by the following vulnerabilities : - A heap-based buffer overflow vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1885) - A memory corruption vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1886) - A use-after-free vulnerability exists due to the way the application handles memory when opening Excel files. (CVE-2012-1887) - A stack-based buffer overflow vulnerability exists due to the way the application handles data structures while parsing Excel files. (CVE-2012-2543) If an attacker can trick a user on the affected host into opening a specially crafted Excel file, it may be possible to leverage these issues to execute arbitrary code subject to the user's privileges."); script_set_attribute(attribute:"see_also", value:"https://www.zerodayinitiative.com/advisories/ZDI-12-184/"); script_set_attribute(attribute:"see_also", value:"https://seclists.org/fulldisclosure/2012/Nov/110"); script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2012/ms12-076"); script_set_attribute(attribute:"solution", value: "Microsoft has released a set of patches for Excel 2003, 2007, 2010, Excel Viewer, and Office Compatibility Pack."); 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_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:"2012/11/13"); script_set_attribute(attribute:"patch_publication_date", value:"2012/11/13"); script_set_attribute(attribute:"plugin_publication_date", value:"2012/11/14"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel"); script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel_viewer"); script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office_compatibility_pack"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Windows : Microsoft Bulletins"); script_copyright(english:"This script is Copyright (C) 2012-2018 Tenable Network Security, Inc."); 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_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 = "MS12-076"; kbs = make_list( "2597126", "2687307", "2687311", "2687313", "2687481" ); if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE); info = ""; vuln = FALSE; ###################################################################### # Excel ###################################################################### installs = get_kb_list("SMB/Office/Excel/*/ProductPath"); if (!isnull(installs)) { foreach install (keys(installs)) { version = install - 'SMB/Office/Excel/' - '/ProductPath'; path = installs[install]; if (isnull(path)) path = "n/a"; ver = split(version, sep:".", keep:FALSE); for (i = 0; i < max_index(ver); i++) ver[i] = int(ver[i]); # Excel 2010. office_sp = get_kb_item("SMB/Office/2010/SP"); if ( (!isnull(office_sp) && office_sp == 1) && ( (ver[0] == 14 && ver[1] == 0 && ver[2] < 6126) || (ver[0] == 14 && ver[1] == 0 && ver[2] == 6126 && ver[3] < 5003) ) ) { vuln = TRUE; info = '\n Product : Excel 2010' + '\n File : ' + path + '\n Installed version : ' + version + '\n Fixed version : 14.0.6126.5003' + '\n'; hotfix_add_report(info, bulletin:bulletin, kb:"2597126"); } # Excel 2007. office_sp = get_kb_item("SMB/Office/2007/SP"); if ( (!isnull(office_sp) && (office_sp == 2 || office_sp == 3)) && ( (ver[0] == 12 && ver[1] == 0 && ver[2] < 6665) || (ver[0] == 12 && ver[1] == 0 && ver[2] == 6665 && ver[3] < 5003) ) ) { vuln = TRUE; info = '\n Product : Excel 2007' + '\n File : ' + path + '\n Installed version : ' + version + '\n Fixed version : 12.0.6665.5003' + '\n'; hotfix_add_report(info, bulletin:bulletin, kb:"2687307"); } # Excel 2003. office_sp = get_kb_item("SMB/Office/2003/SP"); if ((!isnull(office_sp) && office_sp == 3) && (ver[0] == 11 && ver[1] == 0 && ver[2] < 8347)) { vuln = TRUE; info = '\n Product : Excel 2003' + '\n File : ' + path + '\n Installed version : ' + version + '\n Fixed version : 11.0.8347.0' + '\n'; hotfix_add_report(info, bulletin:bulletin, kb:"2687481"); } } } ###################################################################### # Excel Viewer ###################################################################### version = ''; installs = get_kb_list("SMB/Office/ExcelViewer/*/ProductPath"); if (!isnull(installs)) { foreach install (keys(installs)) { version = install - 'SMB/Office/ExcelViewer/' - '/ProductPath'; path = installs[install]; if (isnull(path)) path = "n/a"; ver = split(version, sep:".", keep:FALSE); for (i = 0; i < max_index(ver); i++) ver[i] = int(ver[i]); # Excel Viewer. if ( # Excel Viewer 2007 SP2 == 12.0.6424.100 (ver[0] == 12 && ver[1] == 0 && ver[2] >= 6424) && ( (ver[0] == 12 && ver[1] == 0 && ver[2] < 6665) || (ver[0] == 12 && ver[1] == 0 && ver[2] == 6665 && ver[3] < 5003) ) ) { vuln = TRUE; info = '\n Product : Excel Viewer' + '\n File : ' + path + '\n Installed version : ' + version + '\n Fixed version : 12.0.6665.5003' + '\n'; hotfix_add_report(info, bulletin:bulletin, kb:"2687313"); break; } } } x86_path = hotfix_get_commonfilesdir(); x64_path = hotfix_get_programfilesdirx86(); if (!version) { # Additional check if registry key is missing kb = "2687313"; if ( (x86_path && hotfix_is_vulnerable(file:"Xlview.exe", version:"12.0.6665.5003", min_version:"12.0.0.0", path:x86_path + "\Microsoft Office\Office12", bulletin:bulletin, kb:kb)) || (x64_path && hotfix_is_vulnerable(file:"Xlview.exe", arch:"x64", version:"12.0.6665.5003", min_version:"12.0.0.0", path:x64_path + "\Microsoft Office\Office12", bulletin:bulletin, kb:kb)) ) vuln = TRUE; } ###################################################################### # Microsoft Office Compatibility Pack ###################################################################### version = ''; installs = get_kb_list("SMB/Office/ExcelCnv/*/ProductPath"); if (!isnull(installs)) { foreach install (keys(installs)) { version = install - 'SMB/Office/ExcelCnv/' - '/ProductPath'; path = installs[install]; if (isnull(path)) path = "n/a"; ver = split(version, sep:".", keep:FALSE); for (i = 0; i < max_index(ver); i++) ver[i] = int(ver[i]); if ( (ver[0] == 12 && ver[1] == 0 && ver[2] < 6665) || (ver[0] == 12 && ver[1] == 0 && ver[2] == 6665 && ver[3] < 5003) ) { info = '\n Product : 2007 Office system and the Office Compatibility Pack' + '\n File : '+ path + '\n Installed version : '+ version + '\n Fixed version : 12.0.6665.5003' + '\n'; hotfix_add_report(info, bulletin:bulletin, kb:"2687311"); } } } if (!version) { # Additional check if registry key is missing kb = "2687311"; if ( (x86_path && hotfix_is_vulnerable(file:"Excelcnv.exe", version:"12.0.6665.5003", min_version:"12.0.0.0", path:x86_path + "\Microsoft Office\Office12", bulletin:bulletin, kb:kb)) || (x64_path && hotfix_is_vulnerable(file:"Excelcnv.exe", arch:"x64", version:"12.0.6665.5003", min_version:"12.0.0.0", path:x64_path + "\Microsoft Office\Office12", bulletin:bulletin, kb:kb)) ) vuln = TRUE; } if (info || vuln) { set_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"); }
Oval
accepted 2014-06-30T04:05:56.872-04:00 class vulnerability contributors name SecPod Team organization SecPod Technologies name Maria Kedovskaya organization ALTX-SOFT name Maria Mikhno organization ALTX-SOFT
definition_extensions comment Microsoft Excel 2007 SP2 is installed oval oval:org.mitre.oval:def:15538 comment Microsoft Excel 2007 SP3 is installed oval oval:org.mitre.oval:def:15126 comment Microsoft Excel 2010 SP1 is installed oval oval:org.mitre.oval:def:15308 comment Microsoft Excel Viewer 2007 is installed oval oval:org.mitre.oval:def:6006 comment Microsoft Office Compatibility Pack SP3 is installed oval oval:org.mitre.oval:def:15035 comment Microsoft Office Compatibility Pack SP2 is installed oval oval:org.mitre.oval:def:15640
description Stack-based buffer overflow in Microsoft Excel 2007 SP2 and SP3 and 2010 SP1; Office 2011 for Mac; Excel Viewer; and Office Compatibility Pack SP2 and SP3 allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Stack Overflow Vulnerability." family windows id oval:org.mitre.oval:def:15737 status accepted submitted 2012-11-16T09:20:22 title Excel Stack Overflow Vulnerability - MS12-076 version 27 accepted 2012-12-31T04:01:38.846-05:00 class vulnerability contributors name SecPod Team organization SecPod Technologies definition_extensions comment Microsoft Office 2011 for Mac is installed oval oval:org.mitre.oval:def:14753 description Stack-based buffer overflow in Microsoft Excel 2007 SP2 and SP3 and 2010 SP1; Office 2011 for Mac; Excel Viewer; and Office Compatibility Pack SP2 and SP3 allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Stack Overflow Vulnerability." family macos id oval:org.mitre.oval:def:15908 status accepted submitted 2012-11-16T09:20:22 title Excel Stack Overflow Vulnerability - MS12-076 version 4
References
- http://www.securityfocus.com/bid/56431
- http://www.securitytracker.com/id?1027752
- http://www.us-cert.gov/cas/techalerts/TA12-318A.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-076
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15737
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15908