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USN-99-1: PHP4 vulnerabilities

18 March 2005

PHP4 vulnerabilities

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Releases

Details

Stefano Di Paola discovered integer overflows in PHP's pack() and
unpack() functions. A malicious PHP script could exploit these to
break out of safe mode and execute arbitrary code with the privileges
of the PHP interpreter. (CAN-2004-1018)

Note: The second part of CAN-2004-1018 (buffer overflow in the
shmop_write() function) was already fixed in USN-66-1.

Stefan Esser discovered two safe mode bypasses which allowed malicious
PHP scripts to circumvent path restrictions. This was possible by
either using virtual_popen() with a current directory containing shell
metacharacters (CAN-2004-1063) or creating a specially crafted
directory whose length exceeded the capacity of the realpath()
function (CAN-2004-1064).

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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.

Related notices

  • USN-99-2: php4-cgi, libapache2-mod-php4