GLSA-200812-17 : Ruby: Multiple vulnerabilities
Critical Nessus Plugin ID 35188
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200812-17 (Ruby: Multiple vulnerabilities)
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() function (CVE-2008-2662).
Arbitrary code execution or Denial of Service (memory corruption) in the rb_ary_stor() function (CVE-2008-2663).
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 (CVE-2008-2725).
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).
Several safe level bypass vulnerabilities were discovered and reported by Keita Yamaguchi (CVE-2008-3655).
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' (CVE-2008-3657).
Tanaka Akira again found a DNS spoofing vulnerability caused by the resolv.rb implementation using poor randomness (CVE-2008-3905).
Luka Treiber and Mitja Kolsek (ACROS Security) disclosed a Denial of Service (CPU consumption) vulnerability in the REXML module when dealing with recursive entity expansion (CVE-2008-3790).
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.
SolutionAll Ruby users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=dev-lang/ruby-1.8.6_p287-r1'