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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.167 -- Debian Security Advisory DSA-048-1 cfingerd remote printf format attack 26 April 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: cfingerd Vendor: Debian Operating System: Debian GNU/Linux 2.2 Linux Platform: Alpha ARM Intel Motorola PowerPC Sparc Impact: Root Compromise Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ------------------------------------------------------------------------ Debian Security Advisory DSA-048-1 security@debian.org http://www.debian.org/security/ Wichert Akkerman April 19, 2001 - - ------------------------------------------------------------------------ Package : cfingerd Problem type : remote printf format attack Debian-specific: no Megyer Laszlo report on Bugtraq that the cfingerd Debian as distributed with Debian GNU/Linux 2.2 was not careful in its logging code. By combining this with an off-by-one error in the code that copied the username from an ident response cfingerd could exploited by a remote user. Since cfingerd does not drop its root privileges until after it has determined which user to finger an attacker can gain root privileges. This has been fixed in version 1.4.1-1.1, and we recommend that you upgrade your cfingerd package immediately. wget url will fetch the file for you dpkg -i file.deb will install the referenced file. Debian GNU/Linux 2.2 alias potato - - --------------------------------- Potato was released for alpha, arm, i386, m68k, powerpc and sparc. Source archives: http://security.debian.org/dists/stable/updates/main/source/cfingerd_1.4.1-1.1.diff.gz MD5 checksum: 9ea177fd9f986c75da499c52c15d9dbe http://security.debian.org/dists/stable/updates/main/source/cfingerd_1.4.1-1.1.dsc MD5 checksum: c9b3a1bc6bd2cb2dad3916da82df917c http://security.debian.org/dists/stable/updates/main/source/cfingerd_1.4.1.orig.tar.gz MD5 checksum: 0461179bca7bb9b00fb23c0886666cb0 Alpha architecture: http://security.debian.org/dists/stable/updates/main/binary-alpha/cfingerd_1.4.1-1.1_alpha.deb MD5 checksum: 55eebf918692fb12bbcefb512ae9cfad ARM architecture: http://security.debian.org/dists/stable/updates/main/binary-arm/cfingerd_1.4.1-1.1_arm.deb MD5 checksum: 41089c6e44cd1a91beb769070720c597 Intel ia32 architecture: http://security.debian.org/dists/stable/updates/main/binary-i386/cfingerd_1.4.1-1.1_i386.deb MD5 checksum: 6ef1f240c9ab6fa1e94143d020bd782e Motorola 680x0 architecture: http://security.debian.org/dists/stable/updates/main/binary-m68k/cfingerd_1.4.1-1.1_m68k.deb MD5 checksum: 670ed451481a4ade769c3128a95d20f2 PowerPC architecture: http://security.debian.org/dists/stable/updates/main/binary-powerpc/cfingerd_1.4.1-1.1_powerpc.deb MD5 checksum: 9ca4d42c82f49974de09711f9d146c14 Sun Sparc architecture: http://security.debian.org/dists/stable/updates/main/binary-sparc/cfingerd_1.4.1-1.1_sparc.deb MD5 checksum: 898af9044c308cc217cc9d3b0050c34e These packages will be moved into the stable distribution on its next revision. For not yet released architectures please refer to the appropriate directory ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ . - - -- - - ---------------------------------------------------------------------------- apt-get: deb http://security.debian.org/ stable/updates main dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main Mailing list: debian-security-announce@lists.debian.org - -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQB1AwUBOt45HajZR/ntlUftAQGmBQMAkm4KP7W4GRxil13lxR53q0cxm5cblL0+ 66usIp+nc7UHOALZfBLMb4j/dsPk9bdgXDtGWGJ94IO5rcPivPOXir239GSUJsWo eX2zrF+WbgBcGp2ZXv5osVKPt8Nh44PG =9Om/ - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- 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 emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBOugnMih9+71yA2DNAQGOMAQAlhnQawlwwCcsap5oo5J8X7pI/Qj9+N4Q XMQmzeikRqeEwCKOk996CJ+aZigGqZ4AcuDSSFil2TaZRTuMzRXZtUtqzymBWo57 NgMk+UW4Ww5xQ5EM7j10ScrbTGR5eUusk5MWS9hVeDPyNFGgTkQIWRHToZt9x2RI N6Ze7i1naL8= =F7mG -----END PGP SIGNATURE-----