The remote host is missing an update to libpng announced via advisory USN-730-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: libpng12-0 1.2.8rel-5ubuntu0.4 Ubuntu 7.10: libpng12-0 1.2.15~beta5-2ubuntu0.2 Ubuntu 8.04 LTS: libpng12-0 1.2.15~beta5-3ubuntu0.1 Ubuntu 8.10: libpng12-0 1.2.27-1ubuntu0.1 After a standard system upgrade you need to reboot your computer to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-730-1

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)