Vulnerability identifier: #VU44417

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-4905

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ActiveMQ
Server applications / Mail servers

Vendor: Apache Foundation

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and broker crash or hang) by sending many openwire failover:tcp:// connection requests.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ActiveMQ: 1.1 - 1.5, 2.0 - 2.1, 3.2 - 3.2.2, 4.0 - 4.0.2, 4.1.0 - 4.1.2, 5.0.0, 5.1.0, 5.2.0, 5.3.0 - 5.3.2, 5.4.0 - 5.4.3, 5.5.0

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External links
http://openwall.com/lists/oss-security/2011/12/25/2
http://openwall.com/lists/oss-security/2011/12/25/6
http://secunia.com/advisories/47112
http://svn.apache.org/viewvc?view=revision&revision=1209700
http://svn.apache.org/viewvc?view=revision&revision=1211844
http://www.securityfocus.com/bid/50904
http://issues.apache.org/jira/browse/AMQ-3294

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.