USN-112-1: PHP4 vulnerabilities

Releases

• Ubuntu 4.10

Details

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

• libapache2-mod-php4 -
• php4-cgi -

In general, a standard system update will make all the necessary changes.

References

• CVE-2005-1042
• CVE-2005-1043