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[sec-adv] Abyss Web Server Long Request Heap Overflow Vulnerability

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Jul 02 2003 - 08:48:57 CDT

TITLE:
Abyss Web Server Long Request Heap Overflow Vulnerability

READ ONLINE:
http://www.secunia.com/advisories/9160/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
From remote

SOFTWARE:
Abyss Web Server 1.x

DESCRIPTION:
A vulnerability has been reported in Abyss Web Server, which
potentially can be exploited by malicious people to compromise a
vulnerable web server.

The vulnerability is caused due to a boundary error when handling
HTTP requests. This can be exploited by sending an overly long,
specially crafted request, which can cause a heap overflow and allow
arbitrary code execution with the privileges of the web service.

Example:
GET /AAAA...[2048]...AAAA:\ HTTP/1.0

It has futhermore been reported that it is possible to insert
arbitrary headers due to an input validation error in the "Location:"
header returned in a "302 Found" page. This can be exploited by
including the ASCII representations "%0D" (carriage return), "%0A"
(linefeed), and "%20" (space) in an URL.

The vulnerability has been reported in version 1.1.2. However, other
versions may also be affected.

SOLUTION:
Reportedly, the vulnerability has been fixed in version 1.1.6 BETA:
http://www.aprelium.com/news/abws116b1.html

REPORTED BY / CREDITS:
Fozzy

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