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=========================================================== Ubuntu Security Notice USN-99-1 March 18, 2005 php4 vulnerabilities CAN-2004-1018, CAN-2004-1063, CAN-2004-1064 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) The following packages are affected: libapache2-mod-php4 php4-cgi The problem can be corrected by upgrading the affected package to version 4:4.3.8-3ubuntu7.5. In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: 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).