It was discovered that libpng did not properly perform bounds checking in certain operations. An attacker could send a specially crafted PNG image and cause a denial of service in applications linked against libpng. This issue only affected Ubuntu 8.04 LTS. (CVE-2007-5268, CVE-2007-5269)
Tavis Ormandy discovered that libpng did not properly initialize memory. If a user or automated system were tricked into opening a crafted PNG image, an attacker could cause a denial of service via application crash, or possibly execute arbitrary code with the privileges of the user invoking the program. This issue did not affect Ubuntu 8.10. (CVE-2008-1382)
6 March 2009
A security issue affects these releases of Ubuntu and its derivatives:
It was discovered that libpng did not properly perform bounds checking in certain operations. An attacker could send a specially crafted PNG image and cause a denial of service in applications linked against libpng. This issue only affected Ubuntu 8.04 LTS. (CVE-2007-5268, CVE-2007-5269)
Tavis Ormandy discovered that libpng did not properly initialize memory. If a user or automated system were tricked into opening a crafted PNG image, an attacker could cause a denial of service via application crash, or possibly execute arbitrary code with the privileges of the user invoking the program. This issue did not affect Ubuntu 8.10. (CVE-2008-1382)
Harald van Dijk discovered an off-by-one error in libpng. An attacker could could cause an application crash in programs using pngtest. (CVE-2008-3964)
It was discovered that libpng did not properly NULL terminate a keyword string. An attacker could exploit this to set arbitrary memory locations to zero. (CVE-2008-5907)
Glenn Randers-Pehrson discovered that libpng did not properly initialize pointers. If a user or automated system were tricked into opening a crafted PNG file, an attacker could cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0040)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to reboot your computer to effect the necessary changes.
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