Sun Solaris gzip contains a vulnerability that may change the permissions of hard linked files. The specific impact may allow hard linked files compressed by gzip to become readable and able to be modified by unprivileged users.
Gzip is a utility used for compressing and decompressing files. The "-f" (-force) flag is used to force compression or decompression even if the file has multiple hard links. When gzip is used with the "-f" flag on a Sun Solaris 8 machine, it may change the permissions of a hard linked file to 0777, causing a hard link to become readable and able to be modified by unprivileged users, regardless of its previous permission settings.
Note that Solaris 7 and Solaris 9 are not affected by this issue. This vulnerability is only present in versions of gzip prior to 1.3.
Local unprivileged users may be able to read or modify files owned by the user who has invoked gzip as described. Access to system files may inadvertently be granted if the gzip command is issued by a local privileged user.
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This document was written by Will Dormann and is based on the information presented in the Sun Alert notification.
|Date First Published:||2004-10-12|
|Date Last Updated:||2004-10-18 16:44 UTC|