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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2011.0580 Important: dhcp security update 1 June 2011 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: dhcp Publisher: Red Hat Operating System: Red Hat Enterprise Linux AS/ES/WS 3 Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2011-0997 Reference: ESB-2011.0383.2 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2011-0840.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: dhcp security update Advisory ID: RHSA-2011:0840-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-0840.html Issue date: 2011-05-31 CVE Names: CVE-2011-0997 ===================================================================== 1. Summary: Updated dhcp packages that fix one security issue are now available for Red Hat Enterprise Linux 3 Extended Life Cycle Support. The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux AS (v. 3 ELS) - i386 Red Hat Enterprise Linux ES (v. 3 ELS) - i386 3. Description: The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. It was discovered that the DHCP client daemon, dhclient, did not sufficiently sanitize certain options provided in DHCP server replies, such as the client hostname. A malicious DHCP server could send such an option with a specially-crafted value to a DHCP client. If this option's value was saved on the client system, and then later insecurely evaluated by a process that assumes the option is trusted, it could lead to arbitrary code execution with the privileges of that process. (CVE-2011-0997) Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for reporting this issue. All dhclient users should upgrade to these updated packages, which contain a backported patch to correct this issue. 4. Solution: Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 689832 - CVE-2011-0997 dhclient: insufficient sanitization of certain DHCP response values 6. Package List: Red Hat Enterprise Linux AS (v. 3 ELS): Source: dhcp-3.0.1-10.3_EL3.src.rpm i386: dhclient-3.0.1-10.3_EL3.i386.rpm dhcp-3.0.1-10.3_EL3.i386.rpm dhcp-debuginfo-3.0.1-10.3_EL3.i386.rpm dhcp-devel-3.0.1-10.3_EL3.i386.rpm Red Hat Enterprise Linux ES (v. 3 ELS): Source: dhcp-3.0.1-10.3_EL3.src.rpm i386: dhclient-3.0.1-10.3_EL3.i386.rpm dhcp-3.0.1-10.3_EL3.i386.rpm dhcp-debuginfo-3.0.1-10.3_EL3.i386.rpm dhcp-devel-3.0.1-10.3_EL3.i386.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2011-0997.html https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2011 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFN5QSLXlSAg2UNWIIRAsdVAJ9mkD7RcbzsYOkK8JnEQsRSeelYuwCeNmZd LdK24/RBkJXiFOiY5pI8Eig= =HTuE - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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