[ GLSA 200710-22 ] TRAMP: Insecure temporary file creation

[GLSA]

Gentoo Linux Security Advisory

Title: TRAMP: Insecure temporary file creation (GLSA 200710-22)
Severity: normal
Exploitable: local
Date: October 20, 2007
Updated: December 30, 2007
Bug(s): #194713
ID: 200710-22

Synopsis


The TRAMP package for GNU Emacs insecurely creates temporary files.


Background


TRAMP is a remote file editing package for GNU Emacs, a highly
extensible and customizable text editor.


Affected Packages

Package: app-emacs/tramp
Vulnerable: < 2.1.10-r2
Unaffected: >= 2.1.10-r2
Unaffected: < 2.1
Architectures: All supported architectures


Description


Stefan Monnier discovered that the tramp-make-tramp-temp-file()
function creates temporary files in an insecure manner.


Impact


A local attacker could create symbolic links in the directory where the
temporary files are written, pointing to a valid file somewhere on the
filesystem that is writable by the user running TRAMP. When TRAMP
writes the temporary file, the target valid file would then be
overwritten with the contents of the TRAMP temporary file.


Workaround


There is no known workaround at this time.


Resolution


All TRAMP users should upgrade to the latest version: