Watchfire AppScan QA Remote Code Execution

2005.12.16
Risk: High
Local: No
Remote: Yes
CWE: CWE-Other


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

(The following advisory is also available in PDF format for download at: http://www.cybsec.com/vuln/CYBSEC_Security_Advisory_AppScanQA_RemoteCode Exec.pdf) CYBSEC S.A. www.cybsec.com Advisory Name: Watchfire AppScan QA Remote Code Execution ========== Vulnerability Class: Buffer Overflow ============= Release Date: 12/15/2005 ========= Affected Applications: ============== * AppScan QA 5.0.609 / Subscription 7 * AppScan QA 5.0.134 Affected Platforms: ============= * Platform-Independent: Tested on Windows 2000 Server SP4 Local / Remote: Remote ========== Severity: High ====== Author: Mariano Nu?ez Di Croce ===== Vendor Status: ========== * Confirmed, update released. Reference to Vulnerability Disclosure Policy: ============================= http://www.cybsec.com/vulnerability_policy.pdf Product Overview: ============ 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. Vulnerability Description: ================= 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. Proof Of Concept: ============ A Proof of Concept can be found at http://www.cybsec.com/vuln/AppScanQA-RemoteCodeExec-PoC.zip Mitigating Factors: ============ For the exploit to succeed, an AppScan QA user must analyze a web server specially configured to exploit the vulnerability. Solutions: ======= Users should upgrade AppScan QA to Subscription 8, using the AppScan Update Tool. Vendor Response: ============ * 10/12/2005: Initial Vendor Contact. * 10/18/2005: Vendor Confirmed Vulnerability. * 11/02/2005: Vendor Releases Update. * 12/15/2005: Advisory Public Disclosure. Contact Information: ============== 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


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