Bug 443995 - (CVE-2008-1845) CVE-2008-1845 mksh: privilege escalation via unflushed tty
CVE-2008-1845 mksh: privilege escalation via unflushed tty
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
http://nvd.nist.gov/nvd.cfm?cvename=C...
source=gentoo,reported=20080418,publi...
: Security
Depends On:
Blocks:
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Reported: 2008-04-24 10:46 EDT by Tomas Hoger
Modified: 2008-04-24 14:09 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2008-04-24 14:09:24 EDT
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Description Tomas Hoger 2008-04-24 10:46:56 EDT
Common Vulnerabilities and Exposures assigned an identifier CVE-2008-1845 to the following vulnerability:

The Korn shell (aka mksh) before R33d on MirOS (aka MirBSD) does not flush the tty's I/O when invoking mksh in a new terminal, which allows local users to gain privileges by opening a virtual terminal and entering command sequences, which might later be executed in opportunistic circumstances by a different user who launches mksh and specifies that terminal with the -T option.

Refences:
http://www.mirbsd.org/mksh.htm#clog
http://www.securityfocus.com/bid/28768
http://www.osvdb.org/44365
http://secunia.com/advisories/29803
http://xforce.iss.net/xforce/xfdb/41794
Comment 1 Tomas Hoger 2008-04-24 10:48:37 EDT
Fixed upstream version was already pushed to F7/F8:

https://admin.fedoraproject.org/updates/F7/FEDORA-2008-3070
https://admin.fedoraproject.org/updates/F8/FEDORA-2008-3174

Rawhide update mksh-33d-1.fc9 did not make it to F9 before freeze.
Comment 2 Tomas Hoger 2008-04-24 10:52:24 EDT
Robert, have you managed to reproduce this on Fedora?  I must admit that I'm not
quite sure what is the purpose of -T switch, where this can be used in a
meaningful way.
Comment 3 Robert Scheck 2008-04-24 11:41:46 EDT
I didn't reproduce that, I didn't use the -T switch as well. I was just adviced
personally by upstream to update mksh to solve this issue, as it could be minor
security problem (eventually).

Anyway, I'm asking rel-eng to get mksh-33d-1.fc9 into Fedora 9.
Comment 4 Robert Scheck 2008-04-24 13:27:19 EDT
mksh-33d-1.fc9 successfully tagged into f9-final by notting
Comment 5 Tomas Hoger 2008-04-24 14:09:24 EDT
Closing this bug.

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