Bug 443995 (CVE-2008-1845)

Summary:	CVE-2008-1845 mksh: privilege escalation via unflushed tty
Product:	[Other] Security Response	Reporter:	Tomas Hoger <thoger>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	redhat-bugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
URL:	http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1845
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-04-24 18:09:24 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tomas Hoger 2008-04-24 14:46:56 UTC

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 14:48:37 UTC

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 14:52:24 UTC

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 15:41:46 UTC

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 17:27:19 UTC

mksh-33d-1.fc9 successfully tagged into f9-final by notting

Comment 5 Tomas Hoger 2008-04-24 18:09:24 UTC

Closing this bug.