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Apache "Expect" Header Cross-Site Scripting Vulnerability Advisory Available in Danish 

Secunia Advisory: SA21172  
Release Date: 2006-07-25
Last Update: 2006-08-03

Critical:
Less critical
Impact: Cross Site Scripting
Where: From remote
Solution Status: Vendor Patch

Software:Apache 1.3.x
Apache 2.0.x
Apache 2.2.x

CVE reference:CVE-2006-3918 (Secunia mirror)

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Description:
Thiago Zaninotti has discovered a vulnerability in Apache HTTP Server, which can be exploited by malicious people to conduct cross-site scripting attacks.

Input passed to the "Expect:" header is not properly sanitised before being returned to users. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of a vulnerable site.

The vulnerability affects versions prior to 1.3.35, 2.0.58, and 2.2.2.

Secunia has constructed a test, which is available at:
http://secunia.com/expect_header_cross-site_scripting_vulnerability_test/

NOTE: This issue was originally not considered a vulnerability by the researcher and vendor due to the fact that no known vectors existed to exploit it. However, additional research by Amit Klein has proven that this can be exploited via a specially crafted Flash file.

Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, scan using the Network Software Inspector.

Solution:
Update to version 1.3.35, 2.0.58, 2.2.2, or later.

Provided and/or discovered by:
Thiago Zaninotti

Additional information about exploitation:
Amit Klein

Changelog:
2006-08-03: Added CVE reference.

Original Advisory:
Vendor bug report:
http://svn.apache.org/viewvc?view=rev&revision=394965

Thiago Zaninotti:
http://archives.neohapsis.com/archives/bugtraq/2006-05/0151.html

Amit Klein:
http://archives.neohapsis.com/archives/bugtraq/2006-07/0425.html



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

45 Related Secunia Security Advisories, displaying 10

1. Apache mod_imap and mod_status Cross-Site Scripting Vulnerabilities
2. Apache mod_imap and mod_status Cross-Site Scripting Vulnerabilities
3. Apache Modules Multiple Vulnerabilities
4. Apache HTTP Method Request Entity Too Large Cross-Site Scripting
5. Apache mod_proxy "date" Denial of Service Vulnerability
6. Apache Denial of Service and Cross-Site Scripting
7. Apache "mod_alias" URL Validation Canonicalization Vulnerability
8. Apache mod_rewrite Off-By-One Buffer Overflow Vulnerability
9. Apache 2 mod_ssl Denial of Service Vulnerability
10. Apache mod_imap "Referer" Cross-Site Scripting Vulnerability

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If you have new information regarding this Secunia advisory or a product in our database, please send it to us using either our web form or email us at vuln@secunia.com.

Ideas, suggestions, and other feedback are most welcome.








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