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Clam AntiVirus CAB/FSG File Handling and base64 MIME Vulnerabilities
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Secunia Advisory:
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SA17434
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Release Date:
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2005-11-04
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Last Update:
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2006-12-13
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Popularity:
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17,548 views
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Critical:
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Highly 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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Vendor Patch
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| Software: | Clam AntiVirus (clamav) 0.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2005-3303
CVE-2005-3500
CVE-2005-3501
CVE-2006-5874
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Description:
Some vulnerabilities have been reported in Clam AntiVirus (clamav), which can be exploited by malicious people to cause a DoS (Denial of Service) and to compromise a vulnerable system.
1) A boundary error in "libclamav/fsg.c" when unpacking FSG v1.33 compressed executable file can cause a heap-based buffer overflow and can be exploited to execute arbitrary code.
2) A validation error in "libclamav/tnef.c" when handling a CAB file with a malformed header can cause the same block in the file to be scanned repeatedly. This can be exploited to cause an infinite loop, potentially causing a DoS, via a specially crafted CAB file.
3) An error in "libclamav/mspack/cabd.c" when handling a CAB file with a malformed header can cause an infinite loop in the "cabd_find()" function. This can potentially be exploited to cause a DoS via a specially crafted CAB file.
4) A NULL pointer dereference exists when handling malformed base64 encoded MIME attachments. This can be exploited to cause a DoS via specially crafted MIME attachments.
The vulnerabilities have been reported in versions 0.87 and prior.
Solution:
Update to version 0.87.1.
http://sourceforge.net/project/showfiles.php?group_id=86638
Provided and/or discovered by:
1) 3Com's Zero Day Initiative.
2-3) iDEFENSE.
4) Stephen Gran
Changelog:
2005-11-07: Updated "Critical", "Impact", "Description" and credit sections. Added links to "Original Advisory".
2005-11-08: Added CVE references.
2005-12-15: Corrected credit and "Original Advisory" sections.
2006-12-12: Added additional vulnerability reported by Stephen Gran.
Original Advisory:
3Com's Zero Day Initiative:
http://www.zerodayinitiative.com/advisories/ZDI-05-002.html
iDEFENSE:
http://www.idefense.com/application/poi/display?id=333&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=334&type=vulnerabilities
Debian:
http://www.us.debian.org/security/2006/dsa-1232
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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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