Ruby: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200812-17 / ruby
||December 16, 2008
||December 16, 2008: 01
All supported architectures
Multiple vulnerabilities have been discovered in Ruby that allow for
attacks including arbitrary code execution and Denial of Service.
Ruby is an interpreted object-oriented programming language. The
elaborate standard library includes an HTTP server ("WEBRick") and a
class for XML parsing ("REXML").
Multiple vulnerabilities have been discovered in the Ruby interpreter
and its standard libraries. Drew Yao of Apple Product Security
discovered the following flaws:
- Arbitrary code execution
or Denial of Service (memory corruption) in the rb_str_buf_append()
- Arbitrary code execution or Denial
of Service (memory corruption) in the rb_ary_stor() function
- Memory corruption via alloca in the
rb_str_format() function (CVE-2008-2664).
- Memory corruption
("REALLOC_N") in the rb_ary_splice() and rb_ary_replace() functions
- Memory corruption ("beg + rlen") in the
rb_ary_splice() and rb_ary_replace() functions (CVE-2008-2726).
Furthermore, several other vulnerabilities have been reported:
- Tanaka Akira reported an issue with resolv.rb that enables
attackers to spoof DNS responses (CVE-2008-1447).
- Akira Tagoh
of RedHat discovered a Denial of Service (crash) issue in the
rb_ary_fill() function in array.c (CVE-2008-2376).
safe level bypass vulnerabilities were discovered and reported by Keita
- Christian Neukirchen is credited
for discovering a Denial of Service (CPU consumption) attack in the
WEBRick HTTP server (CVE-2008-3656).
- A fault in the dl module
allowed the circumvention of taintness checks which could possibly lead
to insecure code execution was reported by "sheepman"
- Tanaka Akira again found a DNS spoofing
vulnerability caused by the resolv.rb implementation using poor
- Luka Treiber and Mitja Kolsek
(ACROS Security) disclosed a Denial of Service (CPU consumption)
vulnerability in the REXML module when dealing with recursive entity
These vulnerabilities allow remote attackers to execute arbitrary code,
spoof DNS responses, bypass Ruby's built-in security and taintness
checks, and cause a Denial of Service via crash or CPU exhaustion.
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-1.8.6_p287-r1"