Stack-based buffer overflow in xpm_extract_color (io-xpm.c) in the XPM image decoder for gtk+ 2.4.4 (gtk2) and earlier, and gdk-pixbuf before 0.22, may allow remote attackers to execute arbitrary code via a certain color string. NOTE: this identifier is ONLY for gtk+. It was incorrectly referenced in an advisory for a different issue (CVE-2004-0688).

Three security vulnerabilities have been found in the loader for XPM images of the GTK library. These issues are :

  - Potential heap overflow in pixbuf_create_from_xpm().
    (CVE-2004-0782)

  - Potential stack overflow in xpm_extract_color().
    (CVE-2004-0783)

  - Potential integer overflow in the ICO icon format     loader. (CVE-2004-0788)

Depending on the actual application calling the affected library functions, these bugs may be locally or remotely exploitable.

This update fixes a bug in earlier update packages for the same problem.

A heap overflow vulnerability in the GTK+ gdk-pixbuf XPM image rendering library could allow for arbitrary code execution. This allows an attacker to provide a carefully crafted XPM image which could possibly allow for arbitrary code execution in the context of the user viewing the image. (CVE-2005-3186)

Ludwig Nussel discovered an integer overflow bug in the way gdk-pixbuf processes XPM images. An attacker could create a carefully crafted XPM file in such a way that it could cause an application linked with gdk-pixbuf to execute arbitrary code or crash when the file was opened by a victim. (CVE-2005-2976)

Ludwig Nussel also discovered an infinite-loop denial of service bug in the way gdk-pixbuf processes XPM images. An attacker could create a carefully crafted XPM file in such a way that it could cause an application linked with gdk-pixbuf to stop responding when the file was opened by a victim. (CVE-2005-2975)

The gtk+2.0 library also contains the same gdk-pixbuf code with the same vulnerability.

The Corporate Server 2.1 packages have additional patches to address CVE-2004-0782,0783,0788 (additional XPM/ICO image issues), CVE-2004-0753 (BMP image issues) and CVE-2005-0891 (additional BMP issues). These were overlooked on this platform with earlier updates.

The updated packages have been patched to correct these issues.

Chris Evans discovered several flaws in the gdk-pixbuf XPM image decoder :

- Heap-based overflow in pixbuf_create_from_xpm

- Stack-based overflow in xpm_extract_color

- Integer overflows in io-ico.c

Some of these flaws are believed to be exploitable.

Chris Evans discovered several problems in gdk-pixbuf, the GdkPixBuf library used in Gtk. It is possible for an attacker to execute arbitrary code on the victims machine. Gdk-pixbuf for Gtk+1.2 is an external package. For Gtk+2.0 it's part of the main gtk package.

The Common Vulnerabilities and Exposures Project identifies the following vulnerabilities :

  - CAN-2004-0782     Heap-based overflow in pixbuf_create_from_xpm.

  - CAN-2004-0783

    Stack-based overflow in xpm_extract_color.

  - CAN-2004-0788

    Integer overflow in the ico loader.

Chris Evans discovered several problems in gdk-pixbuf, the GdkPixBuf library used in Gtk. It is possible for an attacker to execute arbitrary code on the victims machine. Gdk-pixbuf for Gtk+1.2 is an external package. For Gtk+2.0 it's part of the main gtk package.

The Common Vulnerabilities and Exposures Project identifies the following vulnerabilities :

  - CAN-2004-0753     Denial of service in bmp loader.

  - CAN-2004-0782

    Heap-based overflow in pixbuf_create_from_xpm.

  - CAN-2004-0788

    Integer overflow in the ico loader.

The remote host is affected by the vulnerability described in GLSA-200409-28 (GTK+ 2, gdk-pixbuf: Multiple image decoding vulnerabilities)

    A vulnerability has been discovered in the BMP image preprocessor     (CAN-2004-0753). Furthermore, Chris Evans found a possible integer overflow     in the pixbuf_create_from_xpm() function, resulting in a heap overflow     (CAN-2004-0782). He also found a potential stack-based buffer overflow in     the xpm_extract_color() function (CAN-2004-0783). A possible integer     overflow has also been found in the ICO decoder.
  Impact :

    With a specially crafted BMP image an attacker could cause an affected     application to enter an infinite loop when that image is being processed.
    Also, by making use of specially crafted XPM or ICO images an attacker     could trigger the overflows, which potentially allows the execution of     arbitrary code.
  Workaround :

    There is no known workaround at this time.

The remote host is missing the patch for the advisory SUSE-SA:2004:033 (gtk2, gdk-pixbuf).


gdk-pixbuf is an image loading and rendering library mostly used by GTK and GNOME applications. It is distributed as a separate package for gtk1 and integrated into the gtk2 package. Chris Evans has discovered a heap based, a stack based and an integer overflow in the XPM and ICO loaders of those libraries. The overflows can be exploited by tricking an application to display a malformed image to make it crash or to execute code.

Two Denial of Service conditions were discovered in the input filter of mod_ssl, the module that enables apache to handle HTTPS requests.

Another vulnerability was discovered by the ASF security team using the Codenomicon HTTP Test Tool. This vulnerability, in the apr-util library, can possibly lead to arbitrary code execution if certain non-default conditions are met (enabling the AP_ENABLE_EXCEPTION_HOOK define).

As well, the SITIC have discovered a buffer overflow when Apache expands environment variables in configuration files such as .htaccess and httpd.conf, which can lead to possible privilege escalation. This can only be done, however, if an attacker is able to place malicious configuration files on the server.

Finally, a crash condition was discovered in the mod_dav module by Julian Reschke, where sending a LOCK refresh request to an indirectly locked resource could crash the server.

The updated packages have been patched to protect against these vulnerabilities.

A vulnerability was found in the gdk-pixbug bmp loader where a bad BMP image could send the bmp loader into an infinite loop (CVE-2004-0753).

Chris Evans found a heap-based overflow and a stack-based overflow in the xpm loader of gdk-pixbuf (CVE-2004-0782 and CVE-2004-0783).

Chris Evans also discovered an integer overflow in the ico loader of gdk-pixbuf (CVE-2004-0788).

All four problems have been corrected in these updated packages.

Update :

The previous package had an incorrect patch applied that would cause some problems with other programs. The updated packages have the correct patch applied.

As well, patched gtk+2 packages, which also contain gdk-pixbuf, are now provided.

Updated gdk-pixbuf packages that fix several security flaws are now available.

The gdk-pixbuf package contains an image loading library used with the GNOME GUI desktop environment.

[Updated 15th September 2004] Packages have been updated to correct a bug which caused the xpm loader to fail.

During testing of a previously fixed flaw in Qt (CVE-2004-0691), a flaw was discovered in the BMP image processor of gdk-pixbuf. An attacker could create a carefully crafted BMP file which would cause an application to enter an infinite loop and not respond to user input when the file was opened by a victim. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0753 to this issue.

During a security audit, Chris Evans discovered a stack and a heap overflow in the XPM image decoder. An attacker could create a carefully crafted XPM file which could cause an application linked with gtk2 to crash or possibly execute arbitrary code when the file was opened by a victim. (CVE-2004-0782, CVE-2004-0783)

Chris Evans also discovered an integer overflow in the ICO image decoder. An attacker could create a carefully crafted ICO file which could cause an application linked with gtk2 to crash when the file is opened by a victim. (CVE-2004-0788)

These packages have also been updated to correct a bug which caused the xpm loader to fail.

Users of gdk-pixbuf are advised to upgrade to these packages, which contain backported patches and are not vulnerable to these issues.

Updated gtk2 packages that fix several security flaws and bugs are now available.

The gtk2 package contains the GIMP ToolKit (GTK+), a library for creating graphical user interfaces for the X Window System.

During testing of a previously fixed flaw in Qt (CVE-2004-0691), a flaw was discovered in the BMP image processor of gtk2. An attacker could create a carefully crafted BMP file which would cause an application to enter an infinite loop and not respond to user input when the file was opened by a victim. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0753 to this issue.

During a security audit Chris Evans discovered a stack and a heap overflow in the XPM image decoder. An attacker could create a carefully crafted XPM file which could cause an application linked with gtk2 to crash or possibly execute arbitrary code when the file was opened by a victim. (CVE-2004-0782, CVE-2004-0783)

Chris Evans also discovered an integer overflow in the ICO image decoder. An attacker could create a carefully crafted ICO file which could cause an application linked with gtk2 to crash when the file was opened by a victim. (CVE-2004-0788)

This updated gtk2 package also fixes a few key combination bugs on various X servers, such as Hummingbird, ReflectionX, and X-Win32. If a server was configured to use the Swiss German, Swiss French, or France French keyboard layouts, Mode_Switched characters were unable to be entered within GTK based applications.

Users of gtk2 are advised to upgrade to these packages which contain backported patches and are not vulnerable to these issues.

ID	Name	Product	Family	Severity
41331	SuSE9 Security Update : gdk-pixbuf (YOU Patch Number 9368)	Nessus	SuSE Local Security Checks	high
20446	Mandrake Linux Security Advisory : gdk-pixbuf (MDKSA-2005:214)	Nessus	Mandriva Local Security Checks	high
18908	FreeBSD : gdk-pixbuf -- image decoding vulnerabilities (3d1e9267-073f-11d9-b45d-000c41e2cdad)	Nessus	FreeBSD Local Security Checks	high
15386	Debian DSA-549-1 : gtk+ - several vulnerabilities	Nessus	Debian Local Security Checks	high
15383	Debian DSA-546-1 : gdk-pixbuf - several vulnerabilities	Nessus	Debian Local Security Checks	high
14791	GLSA-200409-28 : GTK+ 2, gdk-pixbuf: Multiple image decoding vulnerabilities	Nessus	Gentoo Local Security Checks	high
14769	SUSE-SA:2004:033: gtk2, gdk-pixbuf	Nessus	SuSE Local Security Checks	high
14752	Mandrake Linux Security Advisory : apache2 (MDKSA-2004:096)	Nessus	Mandriva Local Security Checks	high
14751	Mandrake Linux Security Advisory : gdk-pixbuf/gtk+2 (MDKSA-2004:095-1)	Nessus	Mandriva Local Security Checks	high
14738	RHEL 2.1 / 3 : gdk-pixbuf (RHSA-2004:447)	Nessus	Red Hat Local Security Checks	high
14734	RHEL 3 : gtk2 (RHSA-2004:466)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2004-0783

critical

Tenable Plugins

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