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bug#17428: Bug#747100: emacs23: Insecure use of temporary files in inclu

From: Rob Browning
Subject: bug#17428: Bug#747100: emacs23: Insecure use of temporary files in included lisp libraries/packages
Date: Tue, 06 May 2014 22:38:07 -0500
User-agent: Notmuch/0.18~rc0 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu)

[If possible, please preserve the 747100-forwarded address in any replies.]

The following bug was recently filed against the emacs23 package, and
after some preliminary research, it appears that the security issues
mentioned may still apply to 24.3.  (Though it looks like the relevant
tramp file may now be tramp-sh.el).

Steve Kemp <address@hidden> writes:

> Package: emacs23
> Version: 23.4+1-4
> Severity: important
> There are several tempfile-vulnerabilities present in the Emacs Lisp
> bundled and distributed with the emacs23 package.
> Here are four brief pointers to unsafe code:
> lisp/gnus/gnus-fun.el:
>   In the function `gnus-grab-cam-face` the file "/tmp/gnus.face.ppm" is
>  used, blindly allowing the existing file to be truncated, and symlinks
>  followed.
> lisp/emacs-lisp/find-gc.el:
>   In the function `trace-call-tree` there are some horrific invocations
>  of the csh, which manipulate the directory and symlinks beneath "/tmp/esrc".
> lisp/net/browse-url.el
>   In the function `browse-url-mosaic` the file "/tmp/Mosaic.$PID" is blindly
>  overwritten.  Suspect this whole function is obsolete though :)
> lisp/net/tramp.el
>   The function `tramp-uudecode`, a fallback if a real uudecoding binary
>  is not present, blindly uses "/tmp/tramp.$PID", truncating and removing
>  the file.
> I suspect that each should receive a CVE identifier.

Rob Browning
rlb @defaultvalue.org and @debian.org
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