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XFree86 Multiple Integer Overflow Vulnerabilities
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Secunia Advisory:
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SA9651
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Release Date:
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2003-09-02
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Last Update:
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2003-09-12
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Popularity:
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9,904 views
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Critical:
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Less critical
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Impact:
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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: | XFree86 4.3.x
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| CVE reference: | CVE-2003-0730
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Description:
Multiple vulnerabilities have been reported in XFree86, which potentially can be exploited by malicious users to escalate their privileges on a vulnerable system or compromise it.
The vulnerabilities are caused due to integer overflows in the XFree86 font libraries. Reportedly, the problem is more specifically in the functions handling the transfer and enumeration of fonts from font servers to clients. Since various input isn't checked sufficiently, it is possible to cause a miscalculation of the required buffer sizes, which may lead to buffer overflows.
A malicious user can exploit this to escalate privileges on a vulnerable system by specifying a malicious font server. A malicious person may potentially also be able to compromise a vulnerable system if either xfs or XServer is running in a non-default configuration acting as a client to a font server.
The vulnerabilities have been reported in version 4.3.0.
Solution:
The vulnerabilities have been fixed in the XFree86 4.3.0.2 CVS version.
Exploitation can also be prevented by removing the XFree86 suid bit and ensuring that xfs and Xserver only include trusted font servers in their font search paths.
Provided and/or discovered by:
blexim, Matthieu Herrb.
Original Advisory:
XFree86 4.3 Branch CVS Change Log:
http://www.xfree86.org/cvs/changes_4_3.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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