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TITLE:
OpenBSD bgplg "cmd" Cross-Site Scripting Vulnerability

SECUNIA ADVISORY ID:
SA28726

VERIFY ADVISORY:
http://secunia.com/advisories/28726/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

OPERATING SYSTEM:
OpenBSD 4.1
http://secunia.com/product/16044/
OpenBSD 4.2
http://secunia.com/product/16045/

DESCRIPTION:
Alexandr Polyakov and Anton Karpov have reported a vulnerability in
OpenBSD bgplg, which can be exploited by malicious people to conduct
cross-site scripting attacks.

Input via the "cmd" parameter to the bgplg cgi-bin script is not
properly sanitised before being returned to the user. This can be
exploited to execute arbitrary HTML and script code in a user's
browser session in context of an affected site.

The vulnerability is reported in OpenBSD 4.1. OpenBSD 4.2 may also be
affected.

SOLUTION:
Filter malicious characters and character sequences using a web
proxy. Fixed in CVS repository.
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/bgplg/bgplg.c.diff?r1=1.6&r2=1.7&f=h

PROVIDED AND/OR DISCOVERED BY:
Alexandr Polyakov and Anton Karpov, Digital Security Research Group

ORIGINAL ADVISORY:
http://www.mail-archive.com/misc@openbsd.org/msg49057.html
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/bgplg/bgplg.c

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About:
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