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Trustix Fcron "convert-fcrontab" Two Vulnerabilities
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Secunia Advisory:
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SA18719
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Release Date:
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2006-02-03
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Last Update:
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2006-07-20
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Popularity:
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6,486 views
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| OS: | Trustix Secure Linux 2.2
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| CVE reference: | CVE-2006-0575
CVE-2006-0539
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Description:
Two vulnerabilities have been reported in Fcron, which can be exploited by malicious, local users to gain escalated privileges.
1) A boundary error exists in convert-fcrontab when handling an overly long username supplied via the command line. This can be exploited to cause a heap-based buffer overflow and may allow arbitrary code execution.
2) Missing validation of the username supplied to convert-fcrontab can be exploited to cause the application to create temporary files insecurely outside of "/var/spool/fcron" via directory traversal attacks. This can be exploited via symlink attacks to create or overwrite arbitrary files with the privileges of the root user.
Successful exploitation requires that convert-fcrontab is setuid root (reportedly default setting on Trustix 2.2).
The vulnerability has been reported in Fcron version 2.9.5 included with Trustix 2.2. Other versions may also be affected.
Solution:
Apply updated packages.
Trustix Secure Linux 2.2:
bb2137e71f0f7d4dd23518e11191d9cd 2.2/rpms/fcron-2.9.5.1-4tr.i586.rpm
Provided and/or discovered by:
1) Adam Zabrocki
2) Karol Wiesek
Changelog:
2006-02-09: Added CVE reference.
2006-02-10: Vendor releases fixed packages. Updated "Solution" section.
2006-07-20: Added CVE reference.
Original Advisory:
http://www.trustix.org/errata/2006/0006/
http://lists.grok.org.uk/pipermail/full-disclosure/2006-February/041888.html
http://lists.grok.org.uk/pipermail/full-disclosure/2006-February/041900.html
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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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