Multiple off-by-one errors in the (1) MakeBigReq and (2) SetReqLen macros in include/X11/Xlibint.h in X11R6.x and libX11 before 1.6.0 allow remote attackers to have unspecified impact via a crafted request, which triggers a buffer overflow.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Multiple off-by-one errors in the (1) MakeBigReq and (2) SetReqLen macros in include/X11/Xlibint.h in     X11R6.x and libX11 before 1.6.0 allow remote attackers to have unspecified impact via a crafted request,     which triggers a buffer overflow. (CVE-2013-7439)

Note that Nessus relies on the presence of the package as reported by the vendor.

xorg-x11-libX11 was updated to fix one security issue.

This security issue was fixed :

  - CVE-2013-7439: Multiple off-by-one errors in the (1)     MakeBigReq and (2) SetReqLen macros in     include/X11/Xlibint.h in X11R6.x and libX11 before 1.6.0     allowed remote attackers to have unspecified impact via     a crafted request, which triggered a buffer overflow     (bsc#927220).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Abhishek Arya discovered a buffer overflow in the MakeBigReq macro provided by libx11, which could result in denial of service or the execution of arbitrary code.

Several other xorg packages (e.g. libxrender) will be recompiled against the fixed package after the release of this update. For detailed information on the status of recompiled packages please refer to the Debian Security Tracker at https://security-tracker.debian.org/tracker/CVE-2013-7439

For the oldstable distribution (squeeze), this problem has been fixed in version 2:1.3.3-4+squeeze2.

For the stable distribution (wheezy), this problem has been fixed in version 2:1.5.0-1+deb7u2.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-2568-1 advisory.

    Abhishek Arya discovered that libX11 incorrectly handled memory in the MakeBigReq macro. A remote attacker     could use this issue to cause applications to crash, resulting in a denial of service, or possibly execute     arbitrary code.

    In addition, following the macro fix in libx11, a number of other packages have also been rebuilt as     security updates including libxrender, libxext, libxi, libxfixes, libxrandr, libsdl1.2, libxv, libxp, and     xserver-xorg-video-vmware.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Abhishek Arya discovered a buffer overflow in the MakeBigReq macro provided by libx11, which could result in denial of service or the execution of arbitrary code.

Several other xorg packages (e.g. libxrender) will be recompiled against the fixed package after the release of this update. For detailed information on the status of recompiled packages please refer to the Debian Security Tracker at https://security-tracker.debian.org/tracker/CVE-2013-7439.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:1436 advisory.

    The X11 (Xorg) libraries provide library routines that are used within all     X Window applications.

    Multiple integer overflow flaws, leading to heap-based buffer overflows,     were found in the way various X11 client libraries handled certain protocol     data. An attacker able to submit invalid protocol data to an X11 server via     a malicious X11 client could use either of these flaws to potentially     escalate their privileges on the system. (CVE-2013-1981, CVE-2013-1982,     CVE-2013-1983, CVE-2013-1984, CVE-2013-1985, CVE-2013-1986, CVE-2013-1987,     CVE-2013-1988, CVE-2013-1989, CVE-2013-1990, CVE-2013-1991, CVE-2013-2003,     CVE-2013-2062, CVE-2013-2064)

    Multiple array index errors, leading to heap-based buffer out-of-bounds     write flaws, were found in the way various X11 client libraries handled     data returned from an X11 server. A malicious X11 server could possibly use     this flaw to execute arbitrary code with the privileges of the user running     an X11 client. (CVE-2013-1997, CVE-2013-1998, CVE-2013-1999, CVE-2013-2000,     CVE-2013-2001, CVE-2013-2002, CVE-2013-2066)

    A buffer overflow flaw was found in the way the XListInputDevices()     function of X.Org X11's libXi runtime library handled signed numbers.
    A malicious X11 server could possibly use this flaw to execute arbitrary     code with the privileges of the user running an X11 client. (CVE-2013-1995)

    A flaw was found in the way the X.Org X11 libXt runtime library used     uninitialized pointers. A malicious X11 server could possibly use this flaw     to execute arbitrary code with the privileges of the user running an X11     client. (CVE-2013-2005)

    Two stack-based buffer overflow flaws were found in the way libX11, the     Core X11 protocol client library, processed certain user-specified files.
    A malicious X11 server could possibly use this flaw to crash an X11 client     via a specially crafted file. (CVE-2013-2004)

    The xkeyboard-config package has been upgraded to upstream version 2.11,     which provides a number of bug fixes and enhancements over the previous     version. (BZ#1077471)

    This update also fixes the following bugs:

    * Previously, updating the mesa-libGL package did not update the libX11     package, although it was listed as a dependency of mesa-libGL. This bug has     been fixed and updating mesa-libGL now updates all dependent packages as     expected. (BZ#1054614)

    * Previously, closing a customer application could occasionally cause the X     Server to terminate unexpectedly. After this update, the X Server no longer     hangs when a user closes a customer application. (BZ#971626)

    All X11 client libraries users are advised to upgrade to these updated     packages, which correct these issues and add these enhancements.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
218115	Linux Distros Unpatched Vulnerability : CVE-2013-7439	Nessus	Misc.	critical
85215	SUSE SLED11 / SLES11 Security Update : xorg-x11-libX11 (SUSE-SU-2015:1334-1)	Nessus	SuSE Local Security Checks	high
82785	Debian DLA-199-1 : libx11 security update	Nessus	Debian Local Security Checks	high
82766	Ubuntu 14.04 LTS : libx11, libxrender vulnerability (USN-2568-1)	Nessus	Ubuntu Local Security Checks	critical
82746	Debian DSA-3224-1 : libx11 - security update	Nessus	Debian Local Security Checks	high
78411	RHEL 6 : X11 client libraries (RHSA-2014:1436)	Nessus	Red Hat Local Security Checks	critical

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CVE-2013-7439

critical

Tenable Plugins

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high

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critical