Re: CVE-2014-7817 glibc: command execution in wordexp() with WRDE_NOCMD specified

[mancha <mancha1 () zoho com>]

On Thu, Nov 20, 2014 at 11:38:20AM -0500, Francisco Alonso wrote:
> Hello,
>
> It was discovered that the wordexp() function could ignore the WRDE_NOCMD flag under certain input conditions 
> resulting in the execution 
> of a shell for command substitution when the applicaiton did not request it. 
>
> Bug report:
> https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2014-7817
>
> Git commit:
> https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=a39208bd7fb76c1b01c127b4c61f9bfd915bfe7c
>
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=1157689
> https://sourceware.org/ml/libc-alpha/2014-11/msg00519.html

Francisco, thanks for the post.

After a lightning review of one of my systems, I found the following use
glibc's wordexp: adobe's flash plugin, ardour2, mailx, enca. I've not
looked into which input is under a would-be-attacker's control.

--mancha

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