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KDE Privilege Escalation and Weak Session Cookie
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Secunia Advisory:
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SA9753
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Release Date:
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2003-09-17
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Popularity:
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9,441 views
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Critical:
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Less critical
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Impact:
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Brute force
Privilege escalation
System access
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| Software: | KDE 2.x
KDE 3.x
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| CVE reference: | CVE-2003-0690
CVE-2003-0692
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Description:
Two vulnerabilities have been identified in KDE allowing malicious users to escalate their privileges or malicious people to brute force the session cookie.
1) KDM may grant a valid users root privileges if configured to use the pam_krb5 module. It is uncertain whether this affects other pam modules. The problem is that KDM doesn't check for succesful completion of "pam_setcred()".
2) The algorithm which generates the 128 bit session cookies is weak, potentially allowing malicious people to brute force the session cookie. This could potentially be exploited by malicious people on the local network to gain system access.
This affects all versions of KDE.
Solution:
KDE recommend that users upgrade to version 3.1.4
Patches are available for certain versions:
A patch for KDE 2.2.2 is available from:
ftp://ftp.kde.org/pub/kde/security_patches
4672868343b26e0c0eae91fffeff1f7e post-2.2.2-kdebase-kdm.patch
A patch for KDE 3.0.5b is available from:
ftp://ftp.kde.org/pub/kde/security_patches
fde237203fc7b325c34d2f90a463db3f post-3.0.5-kdebase-kdm.patch
A patch for KDE 3.1.3 is available from:
ftp://ftp.kde.org/pub/kde/security_patches
8553c20798b321e333d8c516636f2297 post-3.1.3-kdebase-kdm.patch
Provided and/or discovered by:
Stephan Kulow
George Lebl
Original Advisory:
http://www.kde.org/info/security/advisory-20030916-1.txt
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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