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TITLE:
AN HTTPD cmdIS.DLL Buffer Overflow and Log File Injection

SECUNIA ADVISORY ID:
SA14861

VERIFY ADVISORY:
http://secunia.com/advisories/14861/

CRITICAL:
Highly critical

IMPACT:
Manipulation of data, System access

WHERE:
>From remote

SOFTWARE:
AN HTTPD 1.x
http://secunia.com/product/543/

DESCRIPTION:
Tan Chew Keong has reported two vulnerabilities in AN HTTPD, which
can be exploited by malicious people to inject arbitrary data into
log files or compromise a vulnerable system.

1) A boundary error in the cmdIS.DLL plug-in can be exploited to
cause a buffer overflow by using the plug-in to parse certain files
and at the same time supply an overly long string (about 8300 bytes)
to the "user-agent", "host", or "accept-encoding" HTTP header.

Successful exploitation allows execution of arbitrary code, but
requires either an accessible ".bat" file using the "set" command
(default install includes "test.bat") or the ability to place or
manipulate a file on the system inside the web root.

2) Missing sanitation of data written to log files can be exploited
to manipulate the contents and e.g. inject fake entries or commands,
which can be exploited to compromise the system in combination with
the first vulnerability.

The vulnerabilities have been reported in version 1.42n. Other
versions may also be affected.

SOLUTION:
Remove the "cmdIS.DLL" file located in the "scripts/" directory.
Also, place the "httpd.log" log file outside the web root.

PROVIDED AND/OR DISCOVERED BY:
Tan Chew Keong

ORIGINAL ADVISORY:
http://www.security.org.sg/vuln/anhttpd142n.html

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