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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0606 -- RHSA-2003:265-01 Updated Sendmail packages fix vulnerability. 29 August 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: sendmail 8.12.x prior to 8.12.9 Publisher: Red Hat Operating System: Red Hat Linux 9 Red Hat Linux 8.0 Linux Impact: Denial of Service Access Required: Remote CVE Names: CAN-2003-0688 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - - --------------------------------------------------------------------- Red Hat Security Advisory Synopsis: Updated Sendmail packages fix vulnerability. Advisory ID: RHSA-2003:265-01 Issue date: 2003-08-28 Updated on: 2003-08-28 Product: Red Hat Linux Keywords: Cross references: Obsoletes: RHSA-2003:120 CVE Names: CAN-2003-0688 - - --------------------------------------------------------------------- 1. Topic: Updated Sendmail packages are available to fix a vulnerability in the handling of DNS maps. 2. Relevant releases/architectures: Red Hat Linux 8.0 - i386 Red Hat Linux 9 - i386 3. Problem description: Sendmail is a widely used Mail Transport Agent (MTA) which is included in all Red Hat Linux distributions. A bug has been discovered in the handling of DNS maps in Sendmail 8.12 versions before 8.12.9. A remote attacker can exploit this issue to crash the instance of Sendmail dealing with the request. We believe that the nature of the bug would make remote exploitation of this issue difficult, if at all possible. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2003-0688 to this issue. Red Hat Linux 8.0 and 9 include versions of Sendmail vulnerable to this issue, however it only affects sites that use DNS maps through the "enhdnsbl" feature. Sendmail users that have enabled DNS maps are advised to update to the packages contained within this erratum which include a backported patch to correct this vulnerability. Red Hat would like to thank the Sendmail security team for notifying us of this issue. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 103068 - CAN-2003-0688 sendmail remote random free() 6. RPMs required: Red Hat Linux 8.0: SRPMS: ftp://updates.redhat.com/8.0/en/os/SRPMS/sendmail-8.12.8-6.80.src.rpm i386: ftp://updates.redhat.com/8.0/en/os/i386/sendmail-8.12.8-6.80.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/sendmail-doc-8.12.8-6.80.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/sendmail-devel-8.12.8-6.80.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/sendmail-cf-8.12.8-6.80.i386.rpm Red Hat Linux 9: SRPMS: ftp://updates.redhat.com/9/en/os/SRPMS/sendmail-8.12.8-6.90.src.rpm i386: ftp://updates.redhat.com/9/en/os/i386/sendmail-8.12.8-6.90.i386.rpm ftp://updates.redhat.com/9/en/os/i386/sendmail-doc-8.12.8-6.90.i386.rpm ftp://updates.redhat.com/9/en/os/i386/sendmail-devel-8.12.8-6.90.i386.rpm ftp://updates.redhat.com/9/en/os/i386/sendmail-cf-8.12.8-6.90.i386.rpm 7. Verification: MD5 sum Package Name - - -------------------------------------------------------------------------- ac5560196623e14a9b13c6762ca5ca16 8.0/en/os/SRPMS/sendmail-8.12.8-6.80.src.rpm 44a2c0236d7ddab1e78f516a77e0ada7 8.0/en/os/i386/sendmail-8.12.8-6.80.i386.rpm e747860a6f3be7656b8825e2347fb630 8.0/en/os/i386/sendmail-cf-8.12.8-6.80.i386.rpm 2468060ef217ed6744ada284f71e43f9 8.0/en/os/i386/sendmail-devel-8.12.8-6.80.i386.rpm e47b1bb2393e310e70d0ea1a6aa825a5 8.0/en/os/i386/sendmail-doc-8.12.8-6.80.i386.rpm 2e798f9d4b87a136fd4e2b0800635551 9/en/os/SRPMS/sendmail-8.12.8-6.90.src.rpm b449795ddf270ad3e7f5e0b1d3cdd7e4 9/en/os/i386/sendmail-8.12.8-6.90.i386.rpm bc273f94312c562f4ed4eeac32282208 9/en/os/i386/sendmail-cf-8.12.8-6.90.i386.rpm 95ee5dff8fb357dab99a5d30d6e5704e 9/en/os/i386/sendmail-devel-8.12.8-6.90.i386.rpm ee6a858f44090dfd8aadb797a0135ace 9/en/os/i386/sendmail-doc-8.12.8-6.90.i386.rpm These packages are GPG signed by Red Hat for security. Our key is available from https://www.redhat.com/security/keys.html You can verify each package with the following command: rpm --checksig -v <filename> If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: md5sum <filename> 8. References: http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/54367 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0688 9. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://www.redhat.com/solutions/security/news/contact.html Copyright 2003 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE/TailXlSAg2UNWIIRAnuTAJ92WcW0GdrFCiH+aGSlMwVz2tGfCACglJyb GYjCCCVeqKDgOe+emigsPJA= =VKvF - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBP071XSh9+71yA2DNAQFbNAP8C4crggCrei0ZGFdA04ZiASCeJ6rdlL1b C+2iMDyZv2Q7xujWN6N9cOQRKwA6uc/8za9GfPtFjtbcVE4A/pmlqtJZE3KktHTr 79AijoC4TTv9il3czYufAJ0vnst/ZJWUfGGyIZyay10uVB/Xv8lJz82y7maQRdKf 5bdUb+ETOqo= =kYpp -----END PGP SIGNATURE-----