Integer overflow in X.org libXfixes before 5.0.3 on 32-bit platforms might allow remote X servers to gain privileges via a length value of INT_MAX, which triggers the client to stop reading data and get out of sync.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-5437-1 advisory.

  - Integer overflow in X.org libXfixes before 5.0.3 on 32-bit platforms might allow remote X servers to gain     privileges via a length value of INT_MAX, which triggers the client to stop reading data and get out of     sync. (CVE-2016-7944)

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

According to the version of the libXfixes package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - Integer overflow in X.org libXfixes before 5.0.3 on     32-bit platforms might allow remote X servers to gain     privileges via a length value of INT_MAX, which     triggers the client to stop reading data and get out of     sync.(CVE-2016-7944)

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

According to the version of the libXfixes packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - Integer overflow in X.org libXfixes before 5.0.3 on     32-bit platforms might allow remote X servers to gain     privileges via a length value of INT_MAX, which     triggers the client to stop reading data and get out of     sync.(CVE-2016-7944)

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

The remote host is affected by the vulnerability described in GLSA-201704-03 (X.Org: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in X.Org server and       libraries. Please review the CVE identifiers referenced below for       details.
  Impact :

    A local or remote users can utilize the vulnerabilities to attach to the       X.Org session as a user and execute arbitrary code.
  Workaround :

    There is no known workaround at this time.

This update for xorg-x11-libXfixes fixes the following issues :

  - insufficient validation of data from the X server can     cause an integer overflow on 32 bit architectures     (bsc#1002995, CVE-2016-7944)

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.

This update for libXfixes fixes a security issue :

  - insufficient validation of data from the X server could     cause an integer overflow on 32 bit architectures     (boo#1002995, CVE-2016-7944).

This update for the X Window System client libraries fixes a class of privilege escalation issues. A malicious X Server could send specially crafted data to X clients, which allowed for triggering crashes, or privilege escalation if this relationship was untrusted or crossed user or permission level boundaries. libX11, libXfixes, libXi, libXrandr, libXrender, libXtst, libXv, libXvMC were fixed, specifically: libX11 :

  - CVE-2016-7942: insufficient validation of data from the     X server allowed out of boundary memory read     (bsc#1002991) libXfixes :

  - CVE-2016-7944: insufficient validation of data from the     X server can cause an integer overflow on 32 bit     architectures (bsc#1002995) libXi :

  - CVE-2016-7945, CVE-2016-7946: insufficient validation of     data from the X server can cause out of boundary memory     access or endless loops (Denial of Service)     (bsc#1002998) libXtst :

  - CVE-2016-7951, CVE-2016-7952: insufficient validation of     data from the X server can cause out of boundary memory     access or endless loops (Denial of Service)     (bsc#1003012) libXv :

  - CVE-2016-5407: insufficient validation of data from the     X server can cause out of boundary memory and memory     corruption (bsc#1003017) libXvMC :

  - CVE-2016-7953: insufficient validation of data from the     X server can cause a one byte buffer read underrun     (bsc#1003023) libXrender :

  - CVE-2016-7949, CVE-2016-7950: insufficient validation of     data from the X server can cause out of boundary memory     writes (bsc#1003002) libXrandr :

  - CVE-2016-7947, CVE-2016-7948: insufficient validation of     data from the X server can cause out of boundary memory     writes (bsc#1003000)

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.

Security fix for CVE-2016-7944

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

New x11 packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.

This update for the X Window System client libraries fixes a class of privilege escalation issues.

A malicious X Server could send specially crafted data to X clients, which allowed for triggering crashes, or privilege escalation if this relationship was untrusted or crossed user or permission level boundaries.

libX11, libXfixes, libXi, libXrandr, libXrender, libXtst, libXv, libXvMC were fixed, specifically :

libX11 :

  - CVE-2016-7942: insufficient validation of data from the     X server allowed out of boundary memory read     (bsc#1002991)

libXfixes :

  - CVE-2016-7944: insufficient validation of data from the     X server can cause an integer overflow on 32 bit     architectures (bsc#1002995)

libXi :

  - CVE-2016-7945, CVE-2016-7946: insufficient validation of     data from the X server can cause out of boundary memory     access or endless loops (Denial of Service)     (bsc#1002998)

libXtst :

  - CVE-2016-7951, CVE-2016-7952: insufficient validation of     data from the X server can cause out of boundary memory     access or endless loops (Denial of Service)     (bsc#1003012)

libXv :

  - CVE-2016-5407: insufficient validation of data from the     X server can cause out of boundary memory and memory     corruption (bsc#1003017)

libXvMC :

  - CVE-2016-7953: insufficient validation of data from the     X server can cause a one byte buffer read underrun     (bsc#1003023)

libXrender :

  - CVE-2016-7949, CVE-2016-7950: insufficient validation of     data from the X server can cause out of boundary memory     writes (bsc#1003002)

libXrandr :

  - CVE-2016-7947, CVE-2016-7948: insufficient validation of     data from the X server can cause out of boundary memory     writes (bsc#1003000)

This update was imported from the SUSE:SLE-12:Update update project.

It was discovered that there was a integer overflow in libxfixes, a library providing a client interface to the X11 'XFIXES' extension.

The 32 bit field 'rep.length' was not checked for validity, which allowed an integer overflow on 32 bit systems. A malicious server could send INT_MAX as 'length' which was then multiplied by the size of XRectangle. In this case the client would not read the whole data from server, getting out of sync.

For Debian 7 'Wheezy', this issue has been fixed in libxfixes version 1:5.0-4+deb7u2.

We recommend that you upgrade your libxfixes packages.

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.

ID	Name	Product	Family	Severity
161452	Ubuntu 16.04 ESM : libXfixes vulnerability (USN-5437-1)	Nessus	Ubuntu Local Security Checks	critical
140993	EulerOS Virtualization for ARM 64 3.0.6.0 : libXfixes (EulerOS-SA-2020-2045)	Nessus	Huawei Local Security Checks	critical
131634	EulerOS 2.0 SP2 : libXfixes (EulerOS-SA-2019-2481)	Nessus	Huawei Local Security Checks	critical
99276	GLSA-201704-03 : X.Org: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
96031	SUSE SLES11 Security Update : xorg-x11-libXfixes (SUSE-SU-2016:3172-1)	Nessus	SuSE Local Security Checks	critical
95703	openSUSE Security Update : libXfixes (openSUSE-2016-1429)	Nessus	SuSE Local Security Checks	critical
94939	SUSE SLED12 / SLES12 Security Update : X Window System client libraries (SUSE-SU-2016:2828-1)	Nessus	SuSE Local Security Checks	critical
94818	Fedora 25 : libXfixes (2016-72d7f05b90)	Nessus	Fedora Local Security Checks	critical
94481	Fedora 23 : libXfixes (2016-0e7694c456)	Nessus	Fedora Local Security Checks	critical
94439	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : x11 (SSA:2016-305-02)	Nessus	Slackware Local Security Checks	critical
94220	openSUSE Security Update : X Window System client libraries (openSUSE-2016-1214)	Nessus	SuSE Local Security Checks	critical
94075	Debian DLA-654-1 : libxfixes security update	Nessus	Debian Local Security Checks	critical
94036	SUSE SLED12 / SLES12 Security Update : X Window System client libraries (SUSE-SU-2016:2505-1)	Nessus	SuSE Local Security Checks	critical
93932	Fedora 24 : libXfixes (2016-ff5a2f4839)	Nessus	Fedora Local Security Checks	critical

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CVE-2016-7944

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