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AUSCERT External Security Bulletin Redistribution
ESB-2005.0227 -- KDE Security Advisory
Local DCOP denial of service vulnerability
21 March 2005
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AusCERT Security Bulletin Summary
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Product: KDE
Publisher: KDE
Operating System: Linux variants
Impact: Denial of Service
Access: Existing Account
CVE Names: CAN-2005-0396 CAN-2005-0365 CAN-2005-0237
Original Bulletin: http://www.kde.org/info/security/advisory-20050316-1.txt
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KDE Security Advisory: Local DCOP denial of service vulnerability
Original Release Date: 20050316
URL: http://www.kde.org/info/security/advisory-20050316-1.txt
0. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0396
1. Systems affected:
All KDE version prior to KDE 3.4 on systems where multiple users
have access.
2. Overview:
Sebastian Krahmer of the SUSE LINUX Security Team reported a local
denial of service vulnerability in KDE's Desktop Communication
Protocol (DCOP) daemon better known as dcopserver.
A local user can lock up the dcopserver of arbitrary other users
on the same machine by stalling the DCOP authentication process.
Although it is not possible to by pass the authentication process
this way, it can cause a significant reduction in desktop
functionality for the affected users.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2005-0396 to this issue.
3. Impact:
A local user can lock up the dcopserver of arbitrary other users
on the same machine. This can cause a significant reduction in
desktop functionality for the affected users including, but not
limited to, the inability to browse the internet and the inability
to start new applications.
4. Solution:
Upgrade to KDE 3.4.
For older versions of KDE Source code patches have been made
available which fix these vulnerabilities. Contact your OS vendor /
binary package provider for information about how to obtain updated
binary packages.
5. Patch:
A patch for KDE 3.1.x is available from
ftp://ftp.kde.org/pub/kde/security_patches
377c49d8224612fbf09f70f3c09d52f5 post-3.1.5-kdelibs-dcop.patch
A patch for KDE 3.2.x is available from
ftp://ftp.kde.org/pub/kde/security_patches
0948701bffb082c65784dc8a2b648ef0 post-3.2.3-kdelibs-dcop.patch
A patch for KDE 3.3.x is available from
ftp://ftp.kde.org/pub/kde/security_patches
7309e259ae1f29be08bbb70e580da3fb post-3.3.2-kdelibs-dcop.patch
6. Time line and credits:
21/02/2005 KDE Security informed by SUSE LINUX.
21/02/2005 Patches applied to KDE CVS.
02/03/2005 Vendors notified
16/03/2005 KDE Security Advisory released.
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