Bug 1418204 – CVE-2017-5899 s-nail: privsep helper local privilege escalation

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Bug 1418204 - (CVE-2017-5899) CVE-2017-5899 s-nail: privsep helper local privilege escalation

Summary:	CVE-2017-5899 s-nail: privsep helper local privilege escalation

Status:	CLOSED NOTABUG

Aliases:	CVE-2017-5899

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=moderate,public=20170127,repor...
Keywords:	Security

Depends On:
Blocks:	1418205
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Reported:	2017-02-01 04:35 EST by Andrej Nemec
Modified:	2017-02-07 04:05 EST (History)
CC List:	5 users (show)

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Last Closed:	2017-02-01 11:44:07 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2017-02-01 04:35:58 EST

A vulnerability was found in mailx. It was found that the privilege-separated child does not strip path separators from arguments. This potentially allows for a local privilege escalation.

References:

https://www.mail-archive.com/s-nail-users@lists.sourceforge.net/msg00551.html
http://seclists.org/oss-sec/2017/q1/212

Upstream patches:

https://git.sdaoden.eu/cgit/s-nail.git/commit/?id=f797c27efecad45af191c518b7f87fda32ada160
https://git.sdaoden.eu/cgit/s-nail.git/commit/?id=f2699449b66dd702a98925bd1b11153a6f7294bf

Comment 1 Dmitry Butskoy 2017-02-01 11:24:58 EST

Fedora still uses the old mailx-12.5 (from Heirloom project).

It looks that vulnerability had appeared in the new, forked code only (from git.sdaoden.eu), since there are no any "privsep.c" files in the 12.5 version.

Comment 2 Andrej Nemec 2017-02-01 11:26:47 EST

(In reply to Dmitry Butskoy from comment #1)
> Fedora still uses the old mailx-12.5 (from Heirloom project).
> 
> It looks that vulnerability had appeared in the new, forked code only (from
> git.sdaoden.eu), since there are no any "privsep.c" files in the 12.5
> version.

This indeed seems to be the case. Thanks for the input! I have changed fedora to notaffected.

Comment 3 Dmitry Butskoy 2017-02-01 11:31:36 EST

BTW RHEL6/RHEL7 seem not affected too...

Comment 4 Tomas Hoger 2017-02-01 11:44:07 EST

As noted above, this is s-nail issue, not affecting mailx.

Comment 5 Andrej Nemec 2017-02-07 04:05:45 EST

CVE assignment:

http://seclists.org/oss-sec/2017/q1/329

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