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Red Hat Linux RHSA-2002:266-05 Critical: Samba Buffer Overflow

There was a bug in the length checking for encrypted password change requests from clients.. --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: New samba packages available to fix potential security vulnerability Advisory ID: RHSA-2002:266-05 Issue date: 2002-11-22 Updated on: 2002-11-21 Product: Red Hat Linux Keywords: samba security encrypted password change Cross references: Obsoletes: --------------------------------------------------------------------- 1. Topic: New samba packages are available that fix a security vulnerability present in samba versions 2.2.2 through 2.2.6. A potential attacker could gain root access on the target machine. It is strongly encouraged that all Samba users update to the fixed packages. As of this time, there are no known exploits for this vulnerability. 2. Relevant releases/architectures: Red Hat Linux 7.3 - i386 Red Hat Linux 8.0 - i386 3. Problem description: There was a bug in the length checking for encrypted password change requests from clients. A client could potentially send an encrypted password, which, when decrypted with the old hashed password, could be used as a buffer overrun attack on smbd's stack. The attack would have to be crafted such that converting a DOS codepage string to little endian UCS2 unicode would translate into an executable block of code. Thanks to the Debian Samba maintainers for discovering this issue, and to the Samba team for providing the fix (and the problem description text above.) 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 beupdated. 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. RPMs required: Red Hat Linux 7.3: SRPMS: i386: Red Hat Linux 8.0: SRPMS: i386: 6. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 5c8ba729bb3e6d2f0614fd543053e6e9 7.3/en/os/SRPMS/samba-2.2.7-1.7.3.src.rpm 92178f0aa6c7ec0cb2b55c0f32c59ca4 7.3/en/os/i386/samba-2.2.7-1.7.3.i386.rpm 6915d467d9572737dfbfcac916734084 7.3/en/os/i386/samba-client-2.2.7-1.7.3.i386.rpm 56ce43d49614bf5a79b90dfbd4a77235 7.3/en/os/i386/samba-common-2.2.7-1.7.3.i386.rpm 82cbcb8e2c3be661e0e6c1c7f9856ecd 7.3/en/os/i386/samba-swat-2.2.7-1.7.3.i386.rpm 9b5ded05dc9cc2c49c40b686ec78caf7 8.0/en/os/SRPMS/samba-2.2.7-2.src.rpm 4e2339d23bad01690938748d84dac186 8.0/en/os/i386/samba-2.2.7-2.i386.rpm a7a48f9d6d8e45966172ae1b941e0208 8.0/en/os/i386/samba-client-2.2.7-2.i386.rpm 3bd309562e0cdefc8d4cd5b02ee0b71c 8.0/en/os/i386/samba-common-2.2.7-2.i386.rpm 0efdfc0d8de8294c0dd4978a82d15991 8.0/en/os/i386/samba-swat-2.2.7-2.i386.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at About 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 md5sum with the following command: md5sum 7. Contact: The Red Hat security contact is . More contact details at All Red Hat products Copyright(c) 2000, 2001, 2002 Red Hat, Inc. . Urgent notice: a crucial update is now available for Samba software on Red Hatdue to a critical buffer overflow flaw compromising credential safety.. samba security, red hat advisory, buffer overflow fix, password vulnerability. . Severity: Critical. LinuxSecurity.com Team

Nov 22, 2002 •Critical Red Hat