Paul Szabo discovered that znew, a script included in the gzip package, creates its temporary files without taking precautions to avoid a symlink attack (CAN-2003-0367).
The gzexe script has a similar vulnerability which was patched in an earlier release but inadvertently reverted.
For the stable distribution (woody) both problems have been fixed in version 1.3.2-3woody1.
For the old stable distribution (potato) CAN-2003-0367 has been fixed in version 1.2.4-33.2. This version is not vulnerable to CVE-1999-1332 due to an earlier patch.
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you update your gzip package.
MD5 checksums of the listed files are available in the original advisory.