[Security Announce] [ MDVSA-2015:164 ] bash

Fabricante: Mandriva
Fecha: 29/03/2015
Identificador: MDVSA-2015:164
[Security Announce] [ MDVSA-2015:164 ] bash
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 _______________________________________________________________________ Mandriva Linux Security Advisory MDVSA-2015:164 http://www.mandriva.com/en/support/security/ _______________________________________________________________________ Package : bash Date : March 29, 2015 Affected: Business Server 2.0 _______________________________________________________________________ Problem Description: Updated bash packages fix security vulnerability: A flaw was found in the way Bash evaluated certain specially crafted environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Certain services and applications allow remote unauthenticated attackers to provide environment variables, allowing them to exploit this issue (CVE-2014-6271). This vulnerability can be exposed and exploited through several other pieces of software and should be considered highly critical. Please refer to the RedHat Knowledge Base article and blog post for more information. It was found that the fix for CVE-2014-6271 was incomplete, and Bash still allowed certain characters to be injected into other environments via specially crafted environment variables. An attacker could potentially use this flaw to override or bypass environment restrictions to execute shell commands. Certain services and applications allow remote unauthenticated attackers to provide environment variables, allowing them to exploit this issue (CVE-2014-7169). Bash has been updated to version 4.2 patch level 50, which further mitigates ShellShock-type vulnerabilities. Two such issues have already been discovered (CVE-2014-6277, CVE-2014-6278). See the RedHat article on the backward-incompatible changes introduced by the latest patch, caused by adding prefixes and suffixes to the variable names used for exporting functions. Note that the RedHat article mentions these variable names will have parentheses "()" at the end of their names, however, the latest upstream patch uses two percent signs "%%" at the end instead. Two other unrelated security issues in the parser have also been fixed in this update (CVE-2014-7186, CVE-2014-7187). All users and sysadmins are advised to update their bash package immediately. _______________________________________________________________________ References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6271 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7169 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6277 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6278 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7186 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7187 http://advisories.mageia.org/MGASA-2014-0388.html http://advisories.mageia.org/MGASA-2014-0393.html http://advisories.mageia.org/MGASA-2014-0388.html https://access.redhat.com/articles/1200223 _______________________________________________________________________ Updated Packages: Mandriva Business Server 2/X86_64: ebf6cac32e8da7f0ab0e083ecb6de7e2 mbs2/x86_64/bash-4.2-53.1.mbs2.x86_64.rpm 3890f0026741d63daec44302d872a8d6 mbs2/x86_64/bash-doc-4.2-53.1.mbs2.x86_64.rpm b44e2a3c7978c291964aee99ac3b2505 mbs2/SRPMS/bash-4.2-53.1.mbs2.src.rpm _______________________________________________________________________ To upgrade automatically use MandrivaUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. All packages are signed by Mandriva for security. You can obtain the GPG public key of the Mandriva Security Team by executing: gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98 You can view other update advisories for Mandriva Linux at: http://www.mandriva.com/en/support/security/advisories/ If you want to report vulnerabilities, please contact security_(at)_mandriva.com _______________________________________________________________________ Type Bits/KeyID Date User ID pub 1024D/22458A98 2000-07-10 Mandriva Security Team -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iD8DBQFVGDlPmqjQ0CJFipgRAgZqAKCOGmz4PsgRwFYU2B+vk3VTyX205QCg8eC/ m5oihNthH+rhu6BJ7GeCQ5o= =hcA1 -----END PGP SIGNATURE-----