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Vulnerability Note VU#579928diffutils sdiff creates temporary files insecurelyOverviewdiffutils, a set of utilities distributed with many versions of linux, contains a utility called sdiff, which creates temporary files of predictable names in an insecure fashion. Using a symbolic link attack, an intruder can cause overwrite of any file writable by the user executing sdiff.I. Descriptionsdiff creates temporary files as part of the file comparison process. Under some conditions, sdiff will create files in /tmp with predictable names, and furthermore does not check for prior existence or ownership of these files.II. ImpactBy creating a series of symbolic links, an intruder can cause sdiff to overwrite any file writable by the user executing sdiff, which may corrupt data or deny service.III. SolutionApply vendor patches; see the Systems Affected section below.Systems Affected
Referenceshttp://www.securityfocus.com/bid/2191 This vulnerability was first described by Greg Kroah-Hartman of Immunix. This document was last modified by Tim Shimeall.
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