USN-116-1: gzip vulnerabilities

Posted by Philipp Esselbach on: 05/04/2005 04:10 AM [ Print | 0 comment(s) ]

gzip security updates are available for Ubuntu Linux 4.10 and 5.04

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Ubuntu Security Notice USN-116-1 May 04, 2005
gzip vulnerabilities
CAN-2005-0988, CAN-2005-1228
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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_1.3.5-9ubuntu3.1.diff.gz
Size/MD5: 58960 9c331f78bcee51c334fb6dd2fcea3878
http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.1.dsc
Size/MD5: 570 e497a2855c0b13d815bcb4153f687a67
http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5.orig.tar.gz
Size/MD5: 331550 3d6c191dfd2bf307014b421c12dc8469

amd64 architecture (Athlon64, Opteron, EM64T Xeon)

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.1_amd64.deb
Size/MD5: 75364 88ae760a3a95bbc077aca0ffc45a3a25

i386 architecture (x86 compatible Intel/AMD)

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.1_i386.deb
Size/MD5: 70262 2d29d42efac460692dbfded6d3adfee5

powerpc architecture (Apple Macintosh G3/G4/G5)

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.1_powerpc.deb
Size/MD5: 76884 f917e7fe2e2cf330123a97e47f891541

Source archives:

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.2.diff.gz
Size/MD5: 58990 2f72cdc16ee3e211cc36d9876f68ec43
http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.2.dsc
Size/MD5: 570 5110df80ff53f90168a67475356d771d
http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5.orig.tar.gz
Size/MD5: 331550 3d6c191dfd2bf307014b421c12dc8469

amd64 architecture (Athlon64, Opteron, EM64T Xeon)

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.2_amd64.deb
Size/MD5: 75480 426bee20a69bb255692cb7be99ca4d0b

i386 architecture (x86 compatible Intel/AMD)

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.2_i386.deb
Size/MD5: 70288 dfed746ac6a4513ddd35dabfd4552d85

powerpc architecture (Apple Macintosh G3/G4/G5)

http://security.ubuntu.com/ubuntu/pool/main/g/gzip/gzip_1.3.5-9ubuntu3.2_powerpc.deb
Size/MD5: 77028 1d10416664379d87e22ca6305628b328