A number of potential remote denial of service vulnerabilities have been identified in ClamAV. In addition to the four issues identified by CVE ID above, there are fixes for issues in libclamav/cvd.c and libclamav/message.c. Together, these issues could allow a carefully crafted message to crash a ClamAV scanner or exhaust various resources on the machine running the scanner.

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.

This advisory adds security support for the stable amd64 distribution.
It covers all security updates since the release of sarge, which were missing updated packages for the not yet official amd64 port. Future security advisories will include updates for this port as well.

このアドバイザリは、安定版（stable）amd64 ディストリビューションのセキュリティサポートを追加します。
sarge リリース以降のすべてのセキュリティ更新がカバーされます。これには、まだ正式ではない amd64 ポートに対する更新済みパッケージがありませんでした。今後のセキュリティアドバイザリには、このポートの更新も含まれる予定です。

此公告添加了对稳定 amd64 发行版本的安全支持。
它涵盖自 sarge 发布以来的所有安全更新，该版本缺少针对尚不是官方 amd64 端口的更新后的程序包。未来的安全公告将也包含此端口的更新。

此公告會新增對穩定之 amd64 發行版本的安全性支援。
其中包含自 sarge 發佈以來的所有安全性更新，但缺少非官方 amd64 連接埠的更新版套件。之後的安全性公告也將包含此連接埠的更新。

The remote host is running ClamAV, an open-source antivirus solution for Unix-like systems.
This version of ClamAV is reported to be vulnerable to a flaw where the parsing of a malicious file will cause the ClamAV process to crash.  An attacker exploiting this flaw would need to be able to send a specially formed email to the system running ClamAV.  Successful exploitation would result in loss of service. 

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
18629	Debian DSA-737-1 : clamav - remote denial of service	Nessus	Debian Local Security Checks	2005/7/6	2021/1/4	medium
19139	FreeBSD : clamav -- cabinet file handling DoS vulnerability (d8e1aadd-ee68-11d9-8310-0001020eed82)	Nessus	FreeBSD Local Security Checks	2005/7/13	2021/1/6	low
57528	Debian DSA-773-1 : amd64 - several vulnerabilities	Nessus	Debian Local Security Checks	2012/1/12	2021/1/4	critical
57528	Debian DSA-773-1：amd64 - いくつかの脆弱性	Nessus	Debian Local Security Checks	2012/1/12	2021/1/4	critical
57528	Debian DSA-773-1：amd64 - 多个漏洞	Nessus	Debian Local Security Checks	2012/1/12	2021/1/4	critical
57528	Debian DSA-773-1 : amd64 - 數個弱點	Nessus	Debian Local Security Checks	2012/1/12	2021/1/4	critical
3033	ClamAV < 0.86.1 Content-parsing DoS (deprecated)	Nessus Network Monitor	Web Clients	2005/6/27	2019/3/6	medium

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