Integer overflow in ALLOCATE_LOCAL in the ProcXCMiscGetXIDList function in the XC-MISC extension in the X.Org X11 server (xserver) 7.1-1.1.0, and other versions before 20070403, allows remote authenticated users to execute arbitrary code via a large expression, which results in memory corruption.

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2007-0127 advisory.

    [1.1.1-48.13.0.1.el5.0.1]
     - add Enterprise Linux detection

     [1.1.1-48.13.0.1.el5]
     - cve-2007-1003.patch. xc misc overflows (#233001)

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

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

From Red Hat Security Advisory 2007:0126 :

Updated X.org packages that fix several security issues are now available for Red Hat Enterprise Linux 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

X.org is an open source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.

iDefense reported an integer overflow flaw in the X.org XC-MISC extension. A malicious authorized client could exploit this issue to cause a denial of service (crash) or potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled various font files. A malicious local user could exploit these issues to potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1351, CVE-2007-1352)

An integer overflow flaw was found in the X.org XGetPixel() function.
Improper use of this function could cause an application calling it to function improperly, possibly leading to a crash or arbitrary code execution. (CVE-2007-1667)

Users of X.org should upgrade to these updated packages, which contain a backported patch and are not vulnerable to these issues.

From Red Hat Security Advisory 2007:0125 :

Updated XFree86 packages that fix a number of security issues are now available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having important security impact by the Red Hat Security Response Team.

XFree86 is an implementation of the X Window System, which provides the core functionality for the Linux graphical desktop.

iDefense reported an integer overflow flaw in the XFree86 XC-MISC extension. A malicious authorized client could exploit this issue to cause a denial of service (crash) or potentially execute arbitrary code with root privileges on the XFree86 server. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled various font files. A malicious local user could exploit these issues to potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1351, CVE-2007-1352)

An integer overflow flaw was found in the XFree86 XGetPixel() function. Improper use of this function could cause an application calling it to function improperly, possibly leading to a crash or arbitrary code execution. (CVE-2007-1667)

Users of XFree86 should upgrade to these updated packages, which contain a backported patch and is not vulnerable to this issue.

This update fixes several integer overflows in Xgl. (CVE-2007-6429 / CVE-2007-1003 / CVE-2007-5958 / CVE-2007-6427 / CVE-2007-6428 / CVE-2007-6429 / CVE-2008-0006)

This update fixes several integer overflows in Xgl (CVE-2007-6429, CVE-2007-1003, CVE-2007-5958, CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, CVE-2008-0006)

Integer overflows in the XC-MISC extension of the X-server could potentially be exploited to execute code with root privileges.
(CVE-2007-1003)

Integer overflows in libx11 could cause crashes. (CVE-2007-1667)

Integer overflows in the font handling of the X-server could potentially be exploited to execute code with root privileges.
(CVE-2007-1352 / CVE-2007-1351)

Sean Larsson of iDefense Labs discovered that the MISC-XC extension of Xorg did not correctly verify the size of allocated memory. An authenticated user could send a specially crafted X11 request and execute arbitrary code with root privileges. (CVE-2007-1003)

Greg MacManus of iDefense Labs discovered that the BDF font handling code in Xorg and FreeType did not correctly verify the size of allocated memory. If a user were tricked into using a specially crafted font, a remote attacker could execute arbitrary code with root privileges. (CVE-2007-1351, CVE-2007-1352).

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

Integer overflows in the XC-MISC extension of the X-server could potentially be exploited to execute code with root privileges (CVE-2007-1003).

Integer overflows in libX11 could cause crashes (CVE-2007-1667).

Integer overflows in the font handling of the X-server could potentially be exploited to execute code with root privileges (CVE-2007-1352, CVE-2007-1351).

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2007:0127 advisory.

  - xserver XC-MISC integer overflow (CVE-2007-1003)

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

Several vulnerabilities have been discovered in the X Window System, which may lead to privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2007-1003     Sean Larsson discovered an integer overflow in the     XC-MISC extension, which might lead to denial of service     or local privilege escalation.

  - CVE-2007-1351     Greg MacManus discovered an integer overflow in the font     handling, which might lead to denial of service or local     privilege escalation.

  - CVE-2007-1352     Greg MacManus discovered an integer overflow in the font     handling, which might lead to denial of service or local     privilege escalation.

  - CVE-2007-1667     Sami Leides discovered an integer overflow in the libx11     library which might lead to the execution of arbitrary     code. This update introduces tighter sanity checking of     input passed to XCreateImage(). To cope with this an     updated rdesktop package is delivered along with this     security update. Another application reported to break     is the proprietary Opera browser, which isn't part of     Debian. The vendor has released updated packages,     though.

The remote host is affected by the vulnerability described in GLSA-200705-10 (LibXfont, TightVNC: Multiple vulnerabilities)

    The libXfont code is prone to several integer overflows, in functions     ProcXCMiscGetXIDList(), bdfReadCharacters() and FontFileInitTable().
    TightVNC contains a local copy of this code and is also affected.
  Impact :

    A local attacker could use a specially crafted BDF Font to gain root     privileges on the vulnerable host.
  Workaround :

    There is no known workaround at this time.

Updated X.org packages that fix several security issues are now available for Red Hat Enterprise Linux 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

X.org is an open source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.

iDefense reported an integer overflow flaw in the X.org XC-MISC extension. A malicious authorized client could exploit this issue to cause a denial of service (crash) or potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled various font files. A malicious local user could exploit these issues to potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1351, CVE-2007-1352)

An integer overflow flaw was found in the X.org XGetPixel() function.
Improper use of this function could cause an application calling it to function improperly, possibly leading to a crash or arbitrary code execution. (CVE-2007-1667)

Users of X.org should upgrade to these updated packages, which contain a backported patch and are not vulnerable to these issues.

Updated XFree86 packages that fix a number of security issues are now available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having important security impact by the Red Hat Security Response Team.

XFree86 is an implementation of the X Window System, which provides the core functionality for the Linux graphical desktop.

iDefense reported an integer overflow flaw in the XFree86 XC-MISC extension. A malicious authorized client could exploit this issue to cause a denial of service (crash) or potentially execute arbitrary code with root privileges on the XFree86 server. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled various font files. A malicious local user could exploit these issues to potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1351, CVE-2007-1352)

An integer overflow flaw was found in the XFree86 XGetPixel() function. Improper use of this function could cause an application calling it to function improperly, possibly leading to a crash or arbitrary code execution. (CVE-2007-1667)

Users of XFree86 should upgrade to these updated packages, which contain a backported patch and is not vulnerable to this issue.

Local exploitation of a memory corruption vulnerability in the X.Org and XFree86 X server could allow an attacker to execute arbitrary code with privileges of the X server, typically root.

The vulnerability exists in the ProcXCMiscGetXIDList() function in the XC-MISC extension. This request is used to determine what resource IDs are available for use. This function contains two vulnerabilities, both result in memory corruption of either the stack or heap. The ALLOCATE_LOCAL() macro used by this function allocates memory on the stack using alloca() on systems where alloca() is present, or using the heap otherwise. The handler function takes a user provided value, multiplies it, and then passes it to the above macro. This results in both an integer overflow vulnerability, and an alloca() stack pointer shifting vulnerability. Both can be exploited to execute arbitrary code. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled various font files. A malicious local user could exploit these issues to potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1351, CVE-2007-1352)

TightVNC uses some of the same code base as Xorg, and has the same vulnerable code.

Updated packages are patched to address these issues.

Update :

Packages for Mandriva Linux 2007.1 are now available.

Local exploitation of a memory corruption vulnerability in the X.Org and XFree86 X server could allow an attacker to execute arbitrary code with privileges of the X server, typically root.

The vulnerability exists in the ProcXCMiscGetXIDList() function in the XC-MISC extension. This request is used to determine what resource IDs are available for use. This function contains two vulnerabilities, both result in memory corruption of either the stack or heap. The ALLOCATE_LOCAL() macro used by this function allocates memory on the stack using alloca() on systems where alloca() is present, or using the heap otherwise. The handler function takes a user provided value, multiplies it, and then passes it to the above macro. This results in both an integer overflow vulnerability, and an alloca() stack pointer shifting vulnerability. Both can be exploited to execute arbitrary code. (CVE-2007-1003)

iDefense reported two integer overflows in the way X.org handled various font files. A malicious local user could exploit these issues to potentially execute arbitrary code with the privileges of the X.org server. (CVE-2007-1351, CVE-2007-1352)

Multiple integer overflows in (1) the XGetPixel function in ImUtil.c in x.org libx11 before 1.0.3, and (2) XInitImage function in xwd.c for ImageMagick, allow user-assisted remote attackers to cause a denial of service (crash) or information leak via crafted images with large or negative values that trigger a buffer overflow. (CVE-2007-1667)

Updated packages are patched to address these issues.

Update :

Packages for Mandriva Linux 2007.1 are now available.

ID	Name	Product	Family	Severity
67466	Oracle Linux 5 : Important: / xorg-x11-server (ELSA-2007-0127)	Nessus	Oracle Linux Local Security Checks	high
67465	Oracle Linux 4 : xorg-x11 (ELSA-2007-0126)	Nessus	Oracle Linux Local Security Checks	high
67464	Oracle Linux 3 : XFree86 (ELSA-2007-0125)	Nessus	Oracle Linux Local Security Checks	high
31780	SuSE 10 Security Update : Xgl (ZYPP Patch Number 5100)	Nessus	SuSE Local Security Checks	high
31779	openSUSE 10 Security Update : xgl (xgl-5099)	Nessus	SuSE Local Security Checks	high
29607	SuSE 10 Security Update : Xorg X11 (ZYPP Patch Number 3083)	Nessus	SuSE Local Security Checks	high
28045	Ubuntu 5.10 / 6.06 LTS / 6.10 : freetype, libxfont, xorg, xorg-server vulnerabilities (USN-448-1)	Nessus	Ubuntu Local Security Checks	high
27496	openSUSE 10 Security Update : xorg-x11-server (xorg-x11-server-3082)	Nessus	SuSE Local Security Checks	high
25322	RHEL 5 : xorg-x11-server (RHSA-2007:0127)	Nessus	Red Hat Local Security Checks	high
25259	Debian DSA-1294-1 : xfree86 - several vulnerabilities	Nessus	Debian Local Security Checks	high
25187	GLSA-200705-10 : LibXfont, TightVNC: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
25006	CentOS 4 : xorg (CESA-2007:0126)	Nessus	CentOS Local Security Checks	high
24950	RHEL 4 : xorg-x11 (RHSA-2007:0126)	Nessus	Red Hat Local Security Checks	high
24949	RHEL 2.1 / 3 : XFree86 (RHSA-2007:0125)	Nessus	Red Hat Local Security Checks	high
24946	Mandrake Linux Security Advisory : tightvnc (MDKSA-2007:080-1)	Nessus	Mandriva Local Security Checks	high
24945	Mandrake Linux Security Advisory : xorg-x11 (MDKSA-2007:079-1)	Nessus	Mandriva Local Security Checks	high
24920	CentOS 3 : XFree86 (CESA-2007:0125)	Nessus	CentOS Local Security Checks	high

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CVE-2007-1003

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