Gentoo: GLSA-201001-09: Ruby: Terminal Control Character Injection
Summary
Giovanni Pellerano, Alessandro Tanasi and Francesco Ongaro reported that WEBrick does not filter terminal control characters, for instance when handling HTTP logs.
Resolution
All Ruby 1.8.7 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.7_p249"
All Ruby 1.8.6 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.6_p388"
References
[ 1 ] CVE-2009-4492 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4492
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201001-09
Concerns
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
Synopsis
An input sanitation flaw in the WEBrick HTTP server included in Ruby might allow remote attackers to inject arbitrary control charactersinto terminal sessions.
Background
Ruby is an interpreted scripting language for quick and easy object-oriented programming. It comes bundled with a HTTP server ("WEBrick").
Affected Packages
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-lang/ruby < 1.8.7_p249 >= 1.8.7_p249 *>= 1.8.6_p388
Impact
===== A remote attacker could send a specially crafted HTTP request to a WEBrick server to inject arbitrary terminal control characters, possibly resulting in the execution of arbitrary commands, data loss, or other unspecified impact. This could also be used to facilitate other attacks.
Workaround
There is no known workaround at this time.