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Ubuntu alert USN-116-1 (gzip)

From:  Martin Pitt <martin.pitt@canonical.com>
To:  ubuntu-security-announce@lists.ubuntu.com
Subject:  [USN-116-1] gzip vulnerabilities
Date:  Wed, 4 May 2005 11:18:03 +0200
Cc:  full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com

=========================================================== Ubuntu Security Notice USN-116-1 May 04, 2005 gzip vulnerabilities CAN-2005-0988, CAN-2005-1228 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog) The following packages are affected: gzip The problem can be corrected by upgrading the affected package to version 1.3.5-9ubuntu3.1 (for Ubuntu 4.10), or 1.3.5-9ubuntu3.2 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: Imran Ghory discovered a race condition in the file permission restore code of gzip and gunzip. While a user was compressing or decompressing a file, a local attacker with write permissions in the directory of that file could replace the target file with a hard link. This would cause gzip to restore the file permissions to the hard link target instead of to the gzip output file, which could be exploited to gain read or even write access to files of other users. (CAN-2005-0988) Ulf Harnhammar found a path traversal vulnerability when gunzip was used with the -N option. An attacker could exploit this to create files in an arbitrary directory with the permissions of a user if he tricked this user to decompress a specially crafted gzip file using the -N option (which can also happen in systems that automatically process uploaded gzip files). (CAN-2005-1228) Source archives: http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 58960 9c331f78bcee51c334fb6dd2fcea3878 http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 570 e497a2855c0b13d815bcb4153f687a67 http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 331550 3d6c191dfd2bf307014b421c12dc8469 amd64 architecture (Athlon64, Opteron, EM64T Xeon) http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 75364 88ae760a3a95bbc077aca0ffc45a3a25 i386 architecture (x86 compatible Intel/AMD) http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 70262 2d29d42efac460692dbfded6d3adfee5 powerpc architecture (Apple Macintosh G3/G4/G5) http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 76884 f917e7fe2e2cf330123a97e47f891541 Source archives: http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 58990 2f72cdc16ee3e211cc36d9876f68ec43 http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 570 5110df80ff53f90168a67475356d771d http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 331550 3d6c191dfd2bf307014b421c12dc8469 amd64 architecture (Athlon64, Opteron, EM64T Xeon) http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 75480 426bee20a69bb255692cb7be99ca4d0b i386 architecture (x86 compatible Intel/AMD) http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 70288 dfed746ac6a4513ddd35dabfd4552d85 powerpc architecture (Apple Macintosh G3/G4/G5) http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1... Size/MD5: 77028 1d10416664379d87e22ca6305628b328 -- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com http://lists.ubuntu.com/mailman/listinfo/ubuntu-security-...


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