--------------------------------------------------------------------- Fedora Legacy Update Advisory Synopsis: Updated Zlib packagea fix security issues Advisory ID: FLSA:162680 Issue date: 2005-09-14 Product: Fedora Core Keywords: Bugfix CVE Names: CAN-2005-1849 CAN-2005-2096 --------------------------------------------------------------------- --------------------------------------------------------------------- 1. Topic: Updated Zlib packages that fix buffer overflows are now available. Zlib is a general-purpose lossless data compression library which is used by many different programs. 2. Relevant releases/architectures: Fedora Core 1 - i386 Fedora Core 2 - i386 3. Problem description: Tavis Ormandy discovered a buffer overflow affecting Zlib version 1.2 and above. An attacker could create a carefully crafted compressed stream that would cause an application to crash if the stream is opened by a user. As an example, an attacker could create a malicious PNG image file which would cause a web browser or mail viewer to crash if the image is viewed. The Common Vulnerabilities and Exposures project assigned the name CAN-2005-2096 to this issue. Markus Oberhumer discovered additional ways a stream could trigger an overflow. An attacker could create a carefully crafted compressed stream that would cause an application to crash if the stream is opened by a user. As an example, an attacker could create a malicious PNG image file that would cause a Web browser or mail viewer to crash if the image is viewed. The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CAN-2005-1849 to this issue. All users should update to these erratum packages which contain a patch from Mark Adler which 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/docs for directions on how to configure yum and apt-get. 5. Bug IDs fixed: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=162680 6. RPMs required: Fedora Core 1: SRPM: http://download.fedoralegacy.org/fedora/1/updates/SRPMS/zlib-1.2.0.7-2.3.legacy.src.rpm i386: http://download.fedoralegacy.org/fedora/1/updates/i386/zlib-1.2.0.7-2.3.legacy.i386.rpm http://download.fedoralegacy.org/fedora/1/updates/i386/zlib-devel-1.2.0.7-2.3.legacy.i386.rpm Fedora Core 2: SRPM: http://download.fedoralegacy.org/fedora/2/updates/SRPMS/zlib-1.2.1.2-0.fc2.2.legacy.src.rpm i386: http://download.fedoralegacy.org/fedora/2/updates/i386/zlib-1.2.1.2-0.fc2.2.legacy.i386.rpm http://download.fedoralegacy.org/fedora/2/updates/i386/zlib-devel-1.2.1.2-0.fc2.2.legacy.i386.rpm 7. Verification: SHA1 sum Package Name --------------------------------------------------------------------- f242225e07d39648b0d7d6558150285ddf7f62d8 fedora/1/updates/i386/zlib-1.2.0.7-2.3.legacy.i386.rpm 618d744e5a8f9a895b40f952a8593985c93fd6d6 fedora/1/updates/i386/zlib-devel-1.2.0.7-2.3.legacy.i386.rpm c812abcd0c5bcfccc86573e81d68ebff5b615ded fedora/1/updates/SRPMS/zlib-1.2.0.7-2.3.legacy.src.rpm d07c43de860f476302fcd1fc82d18db1835e1ba1 fedora/2/updates/i386/zlib-1.2.1.2-0.fc2.2.legacy.i386.rpm f3326c134c6346ca8f120d86d28908ad45907bf9 fedora/2/updates/i386/zlib-devel-1.2.1.2-0.fc2.2.legacy.i386.rpm 2d288f7b2dd848a4c3f36d3ff7c200b9b629c868 fedora/2/updates/SRPMS/zlib-1.2.1.2-0.fc2.2.legacy.src.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 <filename> 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 <filename> 8. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1849 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2096 9. Contact: The Fedora Legacy security contact is <secnotice@xxxxxxxxxxxxxxxx>. More project details at http://www.fedoralegacy.org ---------------------------------------------------------------------
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