Vulnerabilities > CVE-2015-6094 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft Excel, Excel for mac and Sharepoint Server

047910
CVSS 9.3 - CRITICAL
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
network
microsoft
CWE-119
critical
nessus

Summary

Microsoft Excel 2010 SP2, Excel 2013 SP1, Excel 2013 RT SP1, Excel 2016, Excel for Mac 2011, Excel 2016 for Mac, and Excel Services on SharePoint Server 2013 SP1 allow remote attackers to execute arbitrary code via a crafted Office document, aka "Microsoft Office Memory Corruption Vulnerability."

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_idMS15-116
bulletin_url
date2015-11-10T00:00:00
impactRemote Code Execution
knowledgebase_id3104540
knowledgebase_url
severityImportant
titleSecurity Update for Microsoft Office to Address Remote Code Execution

Nessus

  • NASL familyMacOS X Local Security Checks
    NASL idMACOSX_MS15-116_OFFICE.NASL
    descriptionThe version of Microsoft Office installed on the remote Mac OS X host is affected by multiple vulnerabilities : - Multiple remote code execution vulnerabilities exist due to improper handling of objects in memory. A remote attacker can exploit these vulnerabilities by convincing a user to open a specially crafted Office file, resulting in execution of arbitrary code in the context of the current user. (CVE-2015-6038, CVE-2015-6094) - A spoofing vulnerability exists in Microsoft Outlook for Mac due to improper sanitization of HTML content. A remote attacker can exploit this, via a crafted email, to spoof content or to chain an attack to other vulnerabilities in web services. (CVE-2015-6123)
    last seen2020-06-01
    modified2020-06-02
    plugin id86817
    published2015-11-10
    reporterThis script is Copyright (C) 2015-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/86817
    titleMS15-116: Security Updates for Microsoft Office to Address Remote Code Execution (3104540) (Mac OS X)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(86817);
      script_version("1.9");
      script_cvs_date("Date: 2018/07/16 12:48:31");
    
      script_cve_id("CVE-2015-6038", "CVE-2015-6094", "CVE-2015-6123");
      script_xref(name:"MSFT", value:"MS15-116");
      script_xref(name:"IAVA", value:"2015-A-0272");
      script_xref(name:"MSKB", value:"3102924");
      script_xref(name:"MSKB", value:"3102925");
    
      script_name(english:"MS15-116: Security Updates for Microsoft Office to Address Remote Code Execution (3104540) (Mac OS X)");
      script_summary(english:"Checks the 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 version of Microsoft Office installed on the remote Mac OS X host
    is affected by multiple vulnerabilities :
    
      - Multiple remote code execution vulnerabilities exist due
        to improper handling of objects in memory. A remote
        attacker can exploit these vulnerabilities by convincing
        a user to open a specially crafted Office file,
        resulting in execution of arbitrary code in the context
        of the current user. (CVE-2015-6038, CVE-2015-6094)
    
      - A spoofing vulnerability exists in Microsoft Outlook for
        Mac due to improper sanitization of HTML content. A
        remote attacker can exploit this, via a crafted email,
        to spoof content or to chain an attack to other
        vulnerabilities in web services. (CVE-2015-6123)");
      script_set_attribute(attribute:"see_also", value:"https://technet.microsoft.com/library/security/ms15-116");
      script_set_attribute(attribute:"solution", value:
    "Microsoft has released patches for Office for Mac 2011 and for Office
    2016 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:"2015/11/10");
      script_set_attribute(attribute:"patch_publication_date", value:"2015/11/10");
      script_set_attribute(attribute:"plugin_publication_date", value:"2015/11/10");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office:2011:mac");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office:2016:mac");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel_for_mac:2011");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel_for_mac:2016");
      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) 2015-2018 Tenable Network Security, Inc.");
    
      script_dependencies("macosx_office_installed.nbin");
      script_require_keys("Host/MacOSX/Version");
      script_require_ports("installed_sw/Office for Mac 2011", "installed_sw/Microsoft Outlook", "installed_sw/Microsoft Excel", "installed_sw/Microsoft Word", "installed_sw/Microsoft PowerPoint", "installed_sw/Microsoft OneNote");
      exit(0);
    }
    
    include("audit.inc");
    include("global_settings.inc");
    include("misc_func.inc");
    include("install_func.inc");
    
    os = get_kb_item("Host/MacOSX/Version");
    if (!os) audit(AUDIT_OS_NOT, "Mac OS X");
    
    # Office 2011
    apps = make_list(
      "Office for Mac 2011",
      "Microsoft Outlook",
      "Microsoft Excel",
      "Microsoft Word",
      "Microsoft PowerPoint",
      "Microsoft OneNote"
    );
    
    report = "";
    
    foreach app (apps)
    {
      installs = get_installs(app_name:app);
      if (isnull(installs[1])) continue;
      foreach install (installs[1])
      {
        version = install['version'];
        path    = install['path'];
    
        if (version =~ "^14\.") fix = '14.5.8';
        else fix = '15.16';
    
        if (ver_compare(ver:version, fix:fix, strict:FALSE) < 0)
        {
          report +=
            '\n  Product           : ' + app +
            '\n  Installed version : ' + version +
            '\n  Fixed version     : ' + fix;
    
          os = get_kb_item("Host/MacOSX/Version");
    
          if (os =~ "^Mac OS X 10\.[0-9](\.|$)" && app != "Office for Mac 2011")
            report += '\n  Note              : Update will require Mac OS X 10.10.0 or later.\n';
          else report += '\n';
        }
      }
    }
    
    # Report findings.
    if (!empty(report))
    {
      if (report_verbosity > 0) security_hole(port:0, extra:report);
      else security_hole(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    
  • NASL familyWindows : Microsoft Bulletins
    NASL idSMB_NT_MS15-116.NASL
    descriptionThe remote Windows host has a version of Microsoft Office, Access, Excel, InfoPath, OneNote, PowerPoint, Project, Publisher, Visio, Word, Excel Viewer, Word Viewer, SharePoint Server, Office Compatibility Pack, Office Web Apps, Skype for Business, or Lync installed that is affected by multiple vulnerabilities : - Multiple remote code execution vulnerabilities exist due to improper handling of objects in memory. A remote attacker can exploit these vulnerabilities by convincing a user to open a specially crafted Office file, resulting in execution of arbitrary code in the context of the current user. (CVE-2015-6038, CVE-2015-6091, CVE-2015-6092, CVE-2015-6093, CVE-2015-6094) - An elevation of privilege vulnerability exists when an attacker instantiates an affected Office application via a COM control. An attacker who successfully exploits this vulnerability can gain elevated privileges and break out of the Internet Explorer sandbox. (CVE-2015-2503)
    last seen2020-06-01
    modified2020-06-02
    plugin id86823
    published2015-11-10
    reporterThis script is Copyright (C) 2015-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/86823
    titleMS15-116: Security Update for Microsoft Office to Address Remote Code Execution (3104540)