Ruby: Denial of Service vulnerability
Gentoo Linux Security Advisory
||GLSA 200611-12 / ruby
||November 20, 2006
||June 11, 2009: 02
All supported architectures
The Ruby cgi.rb CGI library is vulnerable to a Denial of Service attack.
Ruby is a dynamic, open source programming language with a focus on
simplicity and productivity.
Zed Shaw, Jeremy Kemper, and Jamis Buck of the Mongrel project reported
that the CGI library shipped with Ruby is vulnerable to a remote Denial
of Service by an unauthenticated user.
The vulnerability can be exploited by sending the cgi.rb library an
HTTP request with multipart MIME encoding that contains a malformed
MIME boundary specifier beginning with "-" instead of "--". Successful
exploitation of the vulnerability causes the library to go into an
infinite loop waiting for additional nonexistent input.
There is no known workaround at this time.
All Ruby users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.5-r3"