Netpbm: Multiple temporary file issues

Background

Netpbm is a toolkit containing more than 200 separate utilities for manipulation and conversion of graphic images.

Description

Utilities contained in the Netpbm package prior to the 9.25 version contain defects in temporary file handling. They create temporary files with predictable names without checking first that the target file doesn’t already exist.

Impact

A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When a user or a tool calls one of the affected utilities, this would result in file overwriting with the rights of the user running the utility.

Workaround

There is no known workaround at this time.

Resolution

All Netpbm users should upgrade to an unaffected version:

 # emerge sync

 # emerge -pv ">=media-libs/netpbm-10.0"
 # emerge ">=media-libs/netpbm-10.0"