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):
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
* 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)"
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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Advisory; Patch Information
20100110 Nginx, Varnish, Cherokee, thttpd, mini-httpd, WEBrick, Orion, AOLserver, Yaws and Boa log escape sequence injection