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Vulnerability of Cisco Unified Communications Manager: denials of service

Synthesis of the vulnerability 

An attacker can use five vulnerabilities of Cisco Unified Communications Manager, in order to generate a denial of service.
Vulnerable systems: Cisco CallManager, Cisco CUCM.
Severity of this threat: 3/4.
Number of vulnerabilities in this bulletin: 5.
Creation date: 26/08/2009.
Références of this weakness: 110580, 110849, BID-36152, CERTA-2009-AVI-357, cisco-sa-20090826-cucm, CSCsi46466, CSCsq22534, CSCsx23689, CSCsx32236, CSCsz40392, CVE-2009-2050, CVE-2009-2051, CVE-2009-2052, CVE-2009-2053, CVE-2009-2054, VIGILANCE-VUL-8978.

Description of the vulnerability 

An attacker can use five vulnerabilities of Cisco Unified Communications Manager, in order to generate a denial of service.

An attacker can use a SIP packet with a malformed header, in order to stop the service. [severity:3/4; CERTA-2009-AVI-357, CSCsi46466, CVE-2009-2050]

An attacker can use a malformed SIP INVITE packet, in order to stop the service. [severity:3/4; CSCsz40392, CVE-2009-2051]

An attacker can use several TCP sessions, in order to fill the firewall session table. [severity:2/4; CSCsq22534, CVE-2009-2052]

An attacker can use several SCCP sessions, in order to use all available file descriptors. [severity:2/4; CSCsx32236, CVE-2009-2053]

An attacker can use several SIP sessions, in order to use all available file descriptors. [severity:2/4; CSCsx23689, CVE-2009-2054]
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This computer weakness bulletin impacts software or systems such as Cisco CallManager, Cisco CUCM.

Our Vigil@nce team determined that the severity of this computer threat announce is important.

The trust level is of type confirmed by the editor, with an origin of internet client.

This bulletin is about 5 vulnerabilities.

An attacker with a expert ability can exploit this threat announce.

Solutions for this threat 

Cisco Unified Communications Manager: corrected versions.
The Cisco announce indicates corrected versions and workarounds.
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