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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.660 -- RHSA-2002:266-05 New samba packages available to fix potential security vulnerability 25 November 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: samba Vendor: Red Hat Operating System: Red Hat Linux 8.0 Red Hat Linux 7.3 Platform: i386 Impact: Root Compromise Access Required: Remote Ref: ESB-2002.659 - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- 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 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. RPMs required: Red Hat Linux 7.3: SRPMS: ftp://updates.redhat.com/7.3/en/os/SRPMS/samba-2.2.7-1.7.3.src.rpm i386: ftp://updates.redhat.com/7.3/en/os/i386/samba-2.2.7-1.7.3.i386.rpm ftp://updates.redhat.com/7.3/en/os/i386/samba-common-2.2.7-1.7.3.i386.rpm ftp://updates.redhat.com/7.3/en/os/i386/samba-client-2.2.7-1.7.3.i386.rpm ftp://updates.redhat.com/7.3/en/os/i386/samba-swat-2.2.7-1.7.3.i386.rpm Red Hat Linux 8.0: SRPMS: ftp://updates.redhat.com/8.0/en/os/SRPMS/samba-2.2.7-2.src.rpm i386: ftp://updates.redhat.com/8.0/en/os/i386/samba-2.2.7-2.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/samba-common-2.2.7-2.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/samba-client-2.2.7-2.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/samba-swat-2.2.7-2.i386.rpm 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 http://www.redhat.com/about/contact/pgpkey.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> 7. Contact: The Red Hat security contact is <security@redhat.com>. More contact details at http://www.redhat.com/solutions/security/news/contact.html Copyright(c) 2000, 2001, 2002 Red Hat, Inc. - --------------------------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. 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. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPeIhiSh9+71yA2DNAQGMbwP/U4DLAXP3j/zvp7t6NOVNckjRlxn0dh9O EmHVyC5pBAhFeav5nNybddEG52Y2kFie5yinDmnd/uyxHs5t1U4nAvm/8IpJ/2QE vhNSf2N2NKoCeuy5DapvkUa/1pMnoWDgh0x5OrJN+p0XQbnQuDdJvQSpxAOPwCon ietcYyQxsZ8= =9lwM -----END PGP SIGNATURE-----