full-disclosure - dt_guestbook version 1.0f XSS vulnerability

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Date: Mon, 15 Jan 2007 16:40:42 -0800
From: "Jesper Jurcenoks" <jesper.jurcenoks@...vigilance.com>
To: <full-disclosure@...ts.grok.org.uk>
Subject: dt_guestbook version 1.0f XSS vulnerability

netVigilance Security Advisory #10

dt_guestbook version 1.0f XSS vulnerability 

Description:
dt_guestbook <http://fedorov.vitalain.ru/guestdemo/>  is a
fully-featured message board system with admin interface. Due to program
flaws it is possible for the remote attacker to conduct XSS attacks.

The remote attacker can convince the victim to open a specially crafted
link that is a trusted guestbook server and execute arbitrary code in
the user's browser session.

External References: 
Mitre CVE: CVE-2006-6487
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6487 
NVD NIST: CVE-2006-6487
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2006-6487
OSVDB: 30787 <http://www.osvdb.com/displayvuln.php?osvdb_id=30787>
http://www.osvdb.com/displayvuln.php?osvdb_id=30787

Summary: 
dt_guestbook <http://fedorov.vitalain.ru/guestdemo/>  a fully-featured
message board system with admin interface. 

A security problem in the product allows attackers to conduct XSS
attacks. 
This vulnerability can be exploited only when PHP register_globals is
On.

Release Date: January 15, 2007

Severity:
Risk: Medium

CVSS Metrics
Access Vector: Remote
Access Complexity: High
Authentication: not-required
Confidentiality Impact: Partial
Integrity Impact: Partial
Availability Impact: Partial
Impact Bias: Normal
CVSS Base Score: 5.6

Target Distribution on Internet: Low

Exploitability: Functional Exploit
Remediation Level: Workaround
Report Confidence: Uncorroborated

Vulnerability Impact: Attack
Host Impact: cross-site scripting.

SecureScout Testcase ID:
TC 17940

Vulnerable Systems:
dt_guestbook 1.0f.

Vulnerability Type:
XSS (Cross-Site Scripting) to force a web-site to display malicious
contents to the target, by sending a specially crafted request to the
web-site. The vulnerable web-site is not the target of attack but is
used as a tool for the hacker in the attack of the victim.

Vendor Status: Author Alexander Fedorov was notified on Dec 8 2006 and
agreed to correct the XSS in his product. He has failed to respond to
emails or Chat since Dec 8 2006.
.

Solution: Patch Possibly Pending from Vendor, please check
http://fedorov.vitalain.ru <http://fedorov.vitalain.ru/>  for updates.
.

Workaround:
Set PHP register_globals to Off.

Example: 
HTTP REQUEST
http://[TARGET]/[dt_guestbook_v1-directory]/index.php?submit=1&error[]=%
3Cscript%3Ealert(document.cookie)%3C/script%3E

REPLY

...

will execute <script>alert(document.cookie)</script>

... 

Advisory URL: http://www.netvigilance.com/advisory0009 

Credits: 
Jesper Jurcenoks
Co-founder netVigilance, Inc
www.netvigilance.com <http://www.netvigilance.com> 

Content of type "text/html" skipped

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