CVE-2012-4388

The sapi_header_op function in main/SAPI.c in PHP 5.4.0RC2 through 5.4.0 does not properly determine a pointer during checks for %0D sequences (aka carriage return characters), which allows remote attackers to bypass an HTTP response-splitting protection mechanism via a crafted URL, related to improper interaction between the PHP header function and certain browsers, as demonstrated by Internet Explorer and Google Chrome. NOTE: this vulnerability exists because of an incorrect fix for CVE-2011-1398.

We have discovered 446,732 live websites that are affected by CVE-2012-4388.

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Affected Software

Product	PHP
Category	Programming Languages
Vulnerable Domains	446,732 live websites (6.45% of PHP install base)
Vulnerable Versions	from 0 through 5.4
Vulnerable Versions Count	63 versions ( 12% of all versions)