GTK+ 2, gdk-pixbuf: Multiple image decoding vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200409-28 / gtk+
Release Date	September 21, 2004
Latest Revision	September 21, 2004: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
x11-libs/gtk+	< 2.4.9-r1	>= 2.4.9-r1, < 2.0.0	All supported architectures
media-libs/gdk-pixbuf	< 0.22.0-r3	>= 0.22.0-r3	All supported architectures

Related bugreports: #64230

Synopsis

The GdkPixbuf library, which is also included in GTK+ 2, contains several vulnerabilities that could lead to a Denial of Service or the execution of arbitrary code.

2. Impact Information

Background

GTK+ (GIMP Toolkit +) is a toolkit for creating graphical user interfaces. The GdkPixbuf library provides facilities for image handling. It is available as a standalone library as well as shipped with GTK+ 2.

Description

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All GTK+ 2 users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=x11-libs/gtk+-2.4.9-r1"
# emerge ">=x11-libs/gtk+-2.4.9-r1"

All GdkPixbuf users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge sync
# emerge -pv ">=media-libs/gdk-pixbuf-0.22.0-r3"
# emerge ">=media-libs/gdk-pixbuf-0.22.0-r3"

4. References

Updated September 21, 2004

Summary: This is a Gentoo Linux Security Advisory

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