GLSA-200812-17 : Ruby: Multiple vulnerabilities

This script is Copyright (C) 2008-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The 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).

Impact :

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.

Workaround :

There is no known workaround at this time.

See also :

http://www.gentoo.org/security/en/glsa/glsa-200812-17.xml

Solution :

All Ruby users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=dev-lang/ruby-1.8.6_p287-r1'

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 8.7
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 35188 (gentoo_GLSA-200812-17.nasl)

Bugtraq ID: 30131

CVE ID: CVE-2008-1447
CVE-2008-2376
CVE-2008-2662
CVE-2008-2663
CVE-2008-2664
CVE-2008-2725
CVE-2008-2726
CVE-2008-3655
CVE-2008-3656
CVE-2008-3657
CVE-2008-3790
CVE-2008-3905