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Last updated: 6/1/2016 2:56:28 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2009-4492

Original release date: 01/13/2010
Last revised: 08/23/2011


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.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 5.0 MEDIUM
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information
Per: http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injection "Affected versions * Ruby 1.8.6 patchlevel 383 and all prior versions * Ruby 1.8.7 patchlevel 248 and all prior versions * Development versions of Ruby 1.8 (1.8.8dev) * Ruby 1.9.1 patchlevel 376 and all prior versions * Development versions of Ruby 1.9 (1.9.2dev)"

Vendor Statements (disclaimer)

Official Statement from Red Hat (01/21/2010)
Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-4492 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.

References to Advisories, Solutions, and Tools

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External Source: REDHAT
Name: RHSA-2011:0909
External Source: BID
Name: 37710
External Source: BUGTRAQ
Name: 20100110 Nginx, Varnish, Cherokee, thttpd, mini-httpd, WEBrick, Orion, AOLserver, Yaws and Boa log escape sequence injection
External Source: REDHAT
Name: RHSA-2011:0908
External Source: CONFIRM
Name: http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injection
Type: Advisory; Patch Information
External Source: MISC
Name: http://www.ush.it/team/ush/hack_httpd_escape/adv.txt
External Source: VUPEN
Name: ADV-2010-0089
External Source: SECTRACK
Name: 1023429

Technical Details

Vulnerability Type (View All)