(The following advisory is also available in PDF format for download at:
http://www.cybsec.com/vuln/CYBSEC_Security_Advisory_AppScanQA_RemoteCodeExec.pdf)
CYBSEC S.A.
www.cybsec.com
http://www.cybsec.com/vulnerability_policy.pdf
AppScan QA is an automated web application testing tool that provides QA
personnel with security defect analysis and remediation information.
Instead of manually searching for security defects, application testers
trust AppScan QA to detect security defects and vulnerabilities
automatically as an integrated component of enterprise development and
testing processes. AppScan QA automates test script creation,
modification, and maintenance to ensure reliable and repeatable testing.
The vulnerability specifically exists in the way AppScan QA processes
401 HTTP responses. If a custom 401 response is specially crafted,
containing a WWW-Authenticate header with the Realm field consisting of
more than 351 characters, a buffer overflow occurs, leading to remote
code execution with the privileges of the user running AppScan QA.
A Proof of Concept can be found at
http://www.cybsec.com/vuln/AppScanQA-RemoteCodeExec-PoC.zip
For the exploit to succeed, an AppScan QA user must analyze a web server
specially configured to exploit the vulnerability.
Users should upgrade AppScan QA to Subscription 8, using the AppScan
Update Tool.
For more information regarding the vulnerability feel free to contact
the author at mnunez {at} cybsec.com.
For more information regarding CYBSEC: www.cybsec.com
(c) 2005 - CYBSEC S.A. Security Systems