USN-112-1: PHP4 vulnerabilities

14 April 2005

php4 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 4.10

Software Description


An integer overflow was discovered in the exif_process_IFD_TAG() function in PHP4’s EXIF module. EXIF tags with a specially crafted “Image File Directory” (IFD) tag caused a buffer overflow which could have been exploited to execute arbitrary code with the privileges of the PHP4 server. (CAN-2005-1042)

The same module also contained a Denial of Service vulnerability. EXIF headers with a large IFD nesting level caused an unbound recursion which would eventually overflow the stack and cause the executed program to crash. (CAN-2005-1043)

In web applications that automatically process EXIF tags of uploaded images, both vulnerabilities could be exploited remotely.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 4.10

To update your system, please follow these instructions: