[NEWS] Aprelium Abyss Webserver X1 Arbitrary Code Execution and Header Injection
From: SecuriTeam (support_at_securiteam.com)
To: firstname.lastname@example.org Date: 1 Jul 2003 17:52:18 +0200
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Aprelium Abyss Webserver X1 Arbitrary Code Execution and Header Injection
<http://www.aprelium.com/> Abyss Web Server is "a free, closed-source,
personal web server for Windows and Linux operating systems". The
Hackademy Audit team has found two remote security holes in Abyss
Webserver X1, allowing arbitrary code execution and header injection.
* Aprelium Abyss Webserver version 1.1.2
* Aprelium Abyss Webserver version 1.1.6
Remotely Exploitable Heap Buffer Overflow
A buffer of length 0x800 is allocated on the heap. An unchecked call to
strcpy() can overflow this buffer with a string of almost arbitrary length
and content which is given by a malicious attacker. The request leading to
the overflow is the following. The important part is the two characters
":\" at the end of the requested URL:
GET /AAAAAA[...]AAAA:\ HTTP/1.0
Arbitrary code can be executed on the machine running Abyss Webserver X1
with the privileges of the user running the server. This issue is not
theoretical: we wrote a functional exploit, without need for offset
guessing or brute forcing, which works on Windows 2000 and XP (any SP).
Header Injection Vulnerability
With the same type of request a 302 HTTP code is returned by Abyss X1. The
Location header sent by the server contains the URL initially requested,
but with %xx decoded to ASCII values. Embedding %0D, %0A, and %20 codes
into the URL is allowed, meaning HTTP headers can be added.
This can lead to XSS issues, setting arbitrary cookies, etc.
The information has been provided by <mailto:firstname.lastname@example.org> Fozzy.
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