Apache mod_proxy “ap_proxy_send_fb()” Integer Truncation Vulnerability

SECUNIA ADVISORY ID: SA38319

VERIFY ADVISORY: http://secunia.com/advisories/38319/

DESCRIPTION: Adam Zabrocki has reported a vulnerability in Apache, which can be exploited by malicious people to potentially compromise a vulnerable system.

The vulnerability is caused due to an integer truncation error within the “ap_proxy_send_fb()” function in src/modules/proxy/proxy_util.c, which can be exploited to e.g. cause a heap-based buffer overflow.

Note: This only affects systems where the size of the “long” datatype is bigger than than the size of the “int” datatype (e.g. on 64-bit systems).

The vulnerability is reported in version 1.3.41. Other versions may also be affected.

SOLUTION: Update to version 1.3.42. http://httpd.apache.org/dev/dist/apache_1.3.42.tar.gz

PROVIDED AND/OR DISCOVERED BY: Adam Zabrocki

ORIGINAL ADVISORY: Apache: http://httpd.apache.org/dev/dist/CHANGES_1.3.42

Adam Zabrocki: http://archives.neohapsis.com/archives/fulldisclosure/2010-01/0589.html http://site.pi3.com.pl/adv/mod_proxy.txt http://blog.pi3.com.pl/?p=69

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