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CVE-2009-4492

7.5 · HIGH

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable cha…

Published Jan 13, 2010ruby-langEPSS 16.23%

Overview

CVE-2009-4492 is a high-severity vulnerability affecting ruby-lang webrick. It was published on January 13, 2010 and has a CVSS 2.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Remediation

Check the references section for vendor advisories and patches from ruby-lang. Update webrick to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
ruby-langruby1.8.6Affected

References

Refsecunia.com/advisories/37949Refsecuritytracker.com/id?1023429Refwww.redhat.com/support/errata/RHSA-2011-0908.htmlRefwww.redhat.com/support/errata/RHSA-2011-0909.htmlRefwww.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injectionRefwww.securityfocus.com/archive/1/508830/100/0/threadedRefwww.securityfocus.com/bid/37710Refwww.ush.it/team/ush/hack_httpd_escape/adv.txtRefwww.vupen.com/english/advisories/2010/0089Refsecunia.com/advisories/37949

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4492?

CVE-2009-4492 is a high-severity vulnerability affecting ruby-lang webrick. It was published on January 13, 2010 and has a CVSS 2.0 base score of 7.5 (HIGH).

How severe is CVE-2009-4492?

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-4492?

Check the references section for vendor advisories and patches from ruby-lang. Update webrick to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-4492?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4492 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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