CVE-2012-2311

Priority
Medium
Description
sapi/cgi/cgi_main.c in PHP before 5.3.13 and 5.4.x before 5.4.3, when
configured as a CGI script (aka php-cgi), does not properly handle query
strings that contain a %3D sequence but no = (equals sign) character, which
allows remote attackers to execute arbitrary code by placing command-line
options in the query string, related to lack of skipping a certain
php_getopt for the 'd' case. NOTE: this vulnerability exists because of an
incomplete fix for CVE-2012-1823.
Ubuntu-Description
It was discovered that PHP, when used as a stand alone CGI processor
for the Apache Web Server, did not properly parse and filter query
strings. This could allow a remote attacker to execute arbitrary code
running with the privilege of the web server. Configurations using
mod_php5 and FastCGI were not vulnerable.
References
Bugs
Notes
 Please see http://www.php.net/archive/2012.php#id2012-05-06-1 for more details
 when using configurations other than as described in
 /usr/share/doc/php5-cgi/README.Debian.gz. The php-security.net
 article has an updated set of mod_rewrite rules that can mitigate
 the vulnerability as well:
  RewriteEngine on
  RewriteCond %{QUERY_STRING} ^[^=]*$
  RewriteCond %{QUERY_STRING} %2d|\- [NC]
  RewriteRule .? - [F,L]
Package
Source: php5 (LP Ubuntu Debian)
Upstream:needs-triage
Ubuntu 12.04 LTS (Precise Pangolin):released (5.3.10-1ubuntu3.1)
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Updated: 2015-07-29 20:40:39 UTC (commit 9756)