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Date: Tue, 24 Jan 2023 15:09:08 -0800
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com,
Hanno Böck
<hanno@...eck.de>
Subject: Re: Directory traversal in sharutils/uudecode and
python uu module
On 12/21/22 10:42, Hanno Böck wrote:
> If one can convince someone with root privileges to decode such a file
> this may thus compromise a system.
Fortunately, the easiest exploit path was mostly removed decades ago:
https://exchange.xforce.ibmcloud.com/vulnerabilities/126
> I got a reply confirming the report from the sharutils developers,
> pointing out that this can be interpreted as expected behavior
> according to the posix standard. I don't expect a fix any time soon,
> their latest release is from 2015.
I started a discussion on the Austin Group mailing list to see if the
standard should be updated, but the argument has mostly leaned towards
"users should either use -o to specify output or look at files before
uudecoding them" (along with suggestions to drop these utilities from
the standard now in favor of base64 encoding utilities).
--
-Alan Coopersmith- alan.coopersmith@...cle.com
Oracle Solaris Engineering - https://blogs.oracle.com/solaris
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