PHP contains a flaw that may allow a context-dependent attacker to gain elevated privileges. The issue is due to an integer signedness error in the printf function family as used on 64 bit machines. When a negative argument number is passed to the php_formatted_print function before a 64 to 32 bit truncation, it may bypass a check for the maximum allowable value causing memory corruption. This may allow an attacker to execute arbitrary code.
Classification
Location:
Local Access Required,
Remote / Network Access
Attack Type:
Input Manipulation
Impact:
Loss of Integrity
Exploit:
Exploit Unknown
Disclosure:
OSVDB Verified,
Vendor Verified
Solution
Upgrade to version 5.2.1 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
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