FreshPorts - VuXML

An Secunia Advisory reports:

Neel Mehta and Alex Wheeler have reported some vulnerabilities in Clam AntiVirus, which can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.

1. Two integer overflow errors in "libclamav/tnef.c" when processing TNEF files can be exploited to cause a heap-based buffer overflow via a specially crafted TNEF file with a length value of -1 in the header.
2. An integer overflow error in "libclamav/chmunpack.c" can be exploited to cause a heap-based buffer overflow via a specially crafted CHM file with a chunk entry that has a filename length of -1.
3. A boundary error in "libclamav/fsg.c" when processing a FSG compressed file can cause a heap-based buffer overflow.

< 0.86.2

le 20050704

Advisory from Moritz Jodeit, November 8th, 2008:

ClamAV contains an off-by-one heap overflow vulnerability in the code responsible for parsing VBA project files. Successful exploitation could allow an attacker to execute arbitrary code with the privileges of the `clamd' process by sending an email with a prepared attachment.

A VBA project file embedded inside an OLE2 office document send as an attachment can trigger the off-by-one.

Entry from Thu Oct 30 13:52:42 CET 2008 (acab) in ChangeLog:

libclamav/vba_extract.c: get_unicode_name off-by-one, bb#1239 reported by Moritz Jodeit >moritz*jodeit.org<

< 0.94.1

< 20081105

Gentoo Linux Security Advisory reports:

Clam AntiVirus is vulnerable to a buffer overflow in "libclamav/upx.c" when processing malformed UPX-packed executables. It can also be sent into an infinite loop in "libclamav/fsg.c" when processing specially-crafted FSG-packed executables.

By sending a specially-crafted file an attacker could execute arbitrary code with the permissions of the user running Clam AntiVirus, or cause a Denial of Service.

< 0.87

< 20050917

Clamav team reports:

A heap overflow vulnerability was discovered in libclamav which could cause a denial of service or allow the execution of arbitrary code.

The problem is specifically located in the PE file rebuild function used by the UPX unpacker.

Relevant code from libclamav/upx.c:

memcpy(dst, newbuf, foffset); *dsize = foffset; free(newbuf); cli_dbgmsg("UPX: PE structure rebuilt from compressed file\n"); return 1;

Due to improper validation it is possible to overflow the above memcpy() beyond the allocated memory block.

ge 0.88.1 lt 0.88.4

< 20060808

ClamAV project reports:

ClamAV 0.98.7 is here! This release contains new scanning features and bug fixes.

Fix infinite loop condition on crafted y0da cryptor file. Identified and patch suggested by Sebastian Andrzej Siewior. CVE-2015-2221.

Fix crash on crafted petite packed file. Reported and patch supplied by Sebastian Andrzej Siewior. CVE-2015-2222.

Fix an infinite loop condition on a crafted "xz" archive file. This was reported by Dimitri Kirchner and Goulven Guiheux. CVE-2015-2668.

Apply upstream patch for possible heap overflow in Henry Spencer's regex library. CVE-2015-2305.

Fix crash in upx decoder with crafted file. Discovered and patch supplied by Sebastian Andrzej Siewior. CVE-2015-2170.

< 0.98.7

gt 0

Secunia reports:

Some vulnerabilities have been reported in ClamAV, which can be exploited by malicious people to cause a DoS (Denial of Service) or to compromise a vulnerable system.

1) A boundary error exists within the "cli_scanpe()" function in libclamav/pe.c. This can be exploited to cause a heap-based buffer overflow via a specially crafted "Upack" executable.

Successful exploitation allows execution of arbitrary code.

2) A boundary error within the processing of PeSpin packed executables in libclamav/spin.c can be exploited to cause a heap-based buffer overflow.

Successful exploitation may allow execution of arbitrary code.

3) An unspecified error in the processing of ARJ files can be exploited to hang ClamAV.

< 0.93

< 20080415

The Zero Day Initiative reports:

This vulnerability allows remote attackers to execute arbitrary code on vulnerable Clam AntiVirus installations. Authentication is not required to exploit this vulnerability.

This specific flaw exists within libclamav/upx.c during the unpacking of executable files compressed with UPX. Due to an invalid size calculation during a data copy from the user-controlled file to heap allocated memory, an exploitable memory corruption condition is created.

< 0.88

< 20060110

Secunia reports:

Some vulnerabilities have been reported in ClamAV, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) and compromise a vulnerable system.

An unspecified integer overflow error exists in the PE header parser in "libclamav/pe.c". Successful exploitation requires that the ArchiveMaxFileSize option is disabled.

Some format string errors in the logging handling in "shared/output.c" may be exploited to execute arbitrary code.

An out-of-bounds memory access error in the "cli_bitset_test()" function in "ibclamav/others.c" may be exploited to cause a crash.

< 0.88.1

le 20051104_1

An iDEFENSE Security Advisory reports:

Remote exploitation of an input validation error in Clam AntiVirus ClamAV allows attackers to cause a denial of service condition.

The vulnerability specifically exists due to improper behavior during exceptional conditions.

Successful exploitation allows attackers to exhaust file descriptors pool and memory. Anti-virus detection functionality will fail if there is no file descriptors available with which to open files. Remote exploitation can be achieved by sending a malicious file in an e-mail message or during an HTTP session.

< 0.86

< 20050620

The clamav daemon is vulnerable to a DoS vulnerability due to insufficient handling of malformed zip files which can crash the clamav daemon.

< 0.81

< 20050408

Secunia reports:

Two vulnerabilities have been reported in Clam AntiVirus, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.

1) An unspecified error in the CHM unpacker in chmunpack.c can be exploited to cause a DoS.

2) An unspecified error in rebuildpe.c when rebuilding PE files after unpacking can be exploited to cause a heap-based buffer overflow.

< 0.88.5

le 20060922

Secunia reports:

A vulnerability has been reported in ClamAV, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the HTTP client in the Freshclam command line utility. This can be exploited to cause a stack-based buffer overflow when the HTTP headers received from a web server exceeds 8KB.

Successful exploitation requires that Freshclam is used to download virus signature updates from a malicious mirror web server e.g. via DNS poisoning.

ge 0.80 lt 0.88.2

ge 20040826 lt 20060502

An iDEFENSE Security Advisory reports:

Remote exploitation of an input validation error in Clam AntiVirus ClamAV allows attackers to cause a denial of service condition.

The vulnerability specifically exists due to insufficient validation on cabinet file header data. The ENSURE_BITS() macro fails to check for zero length reads, allowing a carefully constructed cabinet file to cause an infinite loop.

ClamAV is used in a number of mail gateway products. Successful exploitation requires an attacker to send a specially constructed CAB file through a mail gateway or personal anti-virus client utilizing the ClamAV scanning engine. The infinate loop will cause the ClamAV software to use all available processor resources, resulting in a denial of service or severe degradation to system performance. Remote exploitation can be achieved by sending a malicious file in an e-mail message or during an HTTP session.

< 0.86

< 20050620

Hanno Boeck reports:

A fuzzing test showed weakness in the chm parser of clamav, which can possibly be exploited. The clamav team has disabled the chm module in older versions though freshclam updates and has released 0.94 with a fixed parser.

< 0.94

< 20080902

MITRE Advisories report:

The TAR parser allows remote attackers to bypass malware detection via a POSIX TAR file with an initial [aliases] character sequence.

The TAR parser allows remote attackers to bypass malware detection via a TAR archive entry with a length field that exceeds the total TAR file size.

The Microsoft CHM file parser allows remote attackers to bypass malware detection via a crafted reset interval in the LZXC header of a CHM file.

The TAR file parser allows remote attackers to bypass malware detection via a TAR archive entry with a length field corresponding to that entire entry, plus part of the header ofxi the next entry.

< 0.97.5

< 20120612

Secunia reports:

Clam AntiVirus have a vulnerability, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a stack overflow when scanning messages with deeply nested multipart content. This can be exploited to crash the service by sending specially crafted emails to a vulnerable system.

< 0.88.7

le 20061029