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Message-ID: <54D9F6F7.1050802@redhat.com>
Date: Tue, 10 Feb 2015 13:17:59 +0100
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: sudo TZ issue
On 02/09/2015 10:42 PM, Todd C. Miller wrote:
> Beginning with sudo 1.8.12, TZ is only passed through by default
> if it is considered "safe". The TZ variable is now considered
> "unsafe" if any of the following are true:
>
> o It consists of a fully-qualified path name that
> does not match the location of the zoneinfo directory.
>
> o It contains a ".." path element.
>
> o It contains white space or non-printable characters.
>
> o It is longer than the value of PATH_MAX.
You also need to ignore a leading “:” for the absolute path name check,
to match glibc behavior (and potentially others).
The code in sudo 1.8.12 handles this case correctly, but it's not clear
from the description above.
--
Florian Weimer / Red Hat Product Security
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