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USN-99-1: PHP4 vulnerabilities

18 March 2005

PHP4 vulnerabilities



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).

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