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FreeType Integer Overflow and Underflow Vulnerabilities
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Secunia Advisory:
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SA20100
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Release Date:
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2006-05-19
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Last Update:
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2006-07-21
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Popularity:
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11,605 views
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Critical:
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Moderately critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Partial Fix
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| Software: | FreeType 2.x
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2006-0747
CVE-2006-1861
CVE-2006-2493
CVE-2006-3467
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Description:
Some vulnerabilities have been reported in FreeType, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise applications using the library.
1) An integer overflow error exists within the "read_lwfn()" function in src/base/ftmac.c. This can potentially be exploited to cause a heap-based buffer overflow via a specially crafted LWFN file.
The vulnerability has been reported in version 2.2. Prior versions may also be affected.
2) An integer underflow error exists within the "src/pshinter/pshglob.c:psh_blues_set_zones_0()" function when handling a specially crafted font file where the number of blue values is odd. This can be exploited to cause an integer underflow which corrupts the heap.
The vulnerability has been reported in version 2.2. Prior versions may also be affected.
3) Integer overflow errors exist within the BDF, PCF and Type1 font file parsers. This can potentially be exploited to cause a heap-based buffer overflow via a specially crafted font file.
The vulnerabilities have been reported in version 2.1.10. Prior versions may also be affected.
Solution:
Update to version 2.2.1.
http://sourceforge.net/project/showfiles.php?group_id=3157&package_id=3121
NOTE: This version does not properly fix one of the vulnerabilities.
Provided and/or discovered by:
1) Chris Evans
2) Josh Bressers
3) Chris Evans
Changelog:
2006-05-23: Updated advisory with additional vulnerability.
2006-05-25: Added CVE reference.
2006-06-12: Updated advisory with additional information.
2006-07-21: Added information about incorrect patch. Added CVE reference.
Original Advisory:
http://sourceforge.net/project/shownotes.php?release_id=416463
http://scary.beasts.org/security/CESA-2006-001.html
Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=190593
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=183676
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About this Secunia Advisory
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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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