From jkeating@j2solutions.net Tue Jan 27 05:56:19 2004 From: Jesse Keating To: fedora-legacy-announce@redhat.com, bugtraq@securityfocus.com, full-disclosure@lists.netsys.com Date: Mon, 26 Jan 2004 20:46:46 -0800 Subject: [Full-Disclosure] [FLSA-2004:1187] Updated screen resolves security vulnerability -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - ----------------------------------------------------------------------- Fedora Legacy Update Advisory Synopsis: Updated screen resolves security vulnerability Advisory ID: FLSA:1187 Issue date: 2004-01-26 Product: Red Hat Linux Keywords: Security Cross references: https://bugzilla.fedora.us/show_bug.cgi?id=1187 CVE Names: CAN-2003-0972 - ----------------------------------------------------------------------- 1. Topic: Updated screen packages are now available that fix a security vulnerability which may allow privilege escalation for local users, and possibly remote attacks or getting control of another user's screen. 2. Relevant releases/architectures: Red Hat Linux 7.2 - i386 Red Hat Linux 7.3 - i386 Red Hat Linux 8.0 - i386 3. Problem description: The screen utility allows you to have multiple logins on just one terminal. Screen is useful for users who telnet into a machine or are connected via a dumb terminal, but want to use more than just one login. Timo Sirainen has reported an integer signedness error in ansi.c for GNU screen 4.0.1 and earlier, and 3.9.15 and earlier, which allows local users to execute arbitrary code via a large number of ";" (semicolon) characters in escape sequences, which leads to a buffer overflow. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2003-0966 to this issue. Users of screen should update to these update packages, which contain a backported security patch that corrects this issue. Fedora Legacy would like to thank Timo Sirainen for discovering and disclosing this issue, and Jason Rohwedder and Christian Pearce for providing a backported fix for Red Hat Linux 7.2, 7.3, and 8.0. All users are advised to upgrade to these update packages, which contain a backported security patch that corrects 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 yum and apt. Many people find this an easier way to apply updates. To use yum issue: yum update or to use apt: apt-get update; apt-get upgrade This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. This assumes that you have yum or apt-get configured for obtaining Fedora Legacy content. Please visit http://www.fedoralegacy.org/download for directions on how to configure yum and apt-get. 5. Bug IDs fixed: http://bugzilla.fedora.us - 1187 - screen security patch in rh7x, rh8 6. RPMs required: Red Hat Linux 7.2: SRPMS: http://download.fedoralegacy.org/redhat/7.2/updates/SRPMS/screen-3.9.9-4.legacy.src.rpm i386: http://download.fedoralegacy.org/redhat/7.2/updates/i386/screen-3.9.9-4.legacy.i386.rpm Red Hat Linux 7.3: SRPMS: http://download.fedoralegacy.org/redhat/7.3/updates/SRPMS/screen-3.9.11-4.legacy.src.rpm i386: http://download.fedoralegacy.org/redhat/7.3/updates/i386/screen-3.9.11-4.legacy.i386.rpm Red Hat Linux 8.0: SRPMS: http://download.fedoralegacy.org/redhat/8.0/updates/SRPMS/screen-3.9.11-11.legacy.src.rpm i386: http://download.fedoralegacy.org/redhat/8.0/updates/i386/screen-3.9.11-11.legacy.i386.rpm 7. Verification: SHA1 sum Package Name - --------------------------------------------------------------------------- 194fbeb6e1871aad733966eb03525ee3fa6b736e 7.2/updates/SRPMS/screen-3.9.9-4.legacy.src.rpm 38752ec03ec07ab125ab495910861d0317dfe095 7.2/updates/i386/screen-3.9.9-4.legacy.i386.rpm e22108165eeb8a4f2d6f078600117d2a3b5dc88d 7.3/updates/SRPMS/screen-3.9.11-4.legacy.src.rpm 278a76f5b56d32bc983ab5dc388397c98dffe31c 7.3/updates/i386/screen-3.9.11-4.legacy.i386.rpm 578b3166a0f647ac2a798ad81bdea43c9fe55c7b 8.0/updates/SRPMS/screen-3.9.11-11.legacy.src.rpm c1422da61421e74a5a66e5404f1fcd33134c07e8 8.0/updates/i386/screen-3.9.11-11.legacy.i386.rpm These packages are GPG signed by Fedora Legacy for security. Our key is available from http://www.fedoralegacy.org/about/security.php You can verify each package with the following command: rpm --checksig -v If you only wish to verify that each package has not been corrupted or tampered with, examine only the sha1sum with the following command: sha1sum 8. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0972 http://marc.theaimsgroup.com/?l=bugtraq&m=106995837813873&w=2 https://bugzilla.fedora.us/show_bug.cgi?id=1187 9. Contact: The Fedora Legacy security contact is . More project details at https://www.fedoralegacy.org - -- Jesse Keating RHCE (geek.j2solutions.net) Fedora Legacy Team (www.fedoralegacy.org) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQFAFe024v2HLvE71NURApqbAJsFYrZHZWxgUVkzzcHHT94nZ4ZH3QCcC+40 AIDfcZtx909sf83Aop6DAR8= =8quP -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. 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