Cisco Unified Presence and Jabber Extensible Communications Platform (Jabber XCP) contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted device.
vulnerability is due to incorrect handling of Extensible Messaging and Presence Protocol (XMPP) stream headers. An
attacker could exploit this vulnerability by sending a crafted
XMPP stream header. An exploit could cause the Connection Manager
processes to crash, resulting in dropped connections for existing
clients and preventing new client connections. The Connection Manager
processes will restart automatically. However, repeated exploitation
could create a sustained DoS condition.
Cisco has confirmed the vulnerability and released updated software.
Indicators of Compromise
The following Cisco products are affected:
Cisco Unified Presence versions prior to 8.6(3)
Cisco Jabber XCP software versions prior to 5.3
XMPP clients initiate communication with an XMPP server by sending a stream header using IP version 4 (IPv4) or IP version 6 (IPv6). The vulnerability is due to the incorrect handling of XMPP stream headers by the affected system.
An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted XMPP stream header to an affected system. When the affected software processes the malicious stream header, the attacker could cause the Connection Manager processes to terminate abnormally, resulting in dropped connections for existing clients and preventing new clients from connecting. The Connection Manager processes will restart automatically; however, repeated exploitation could create a sustained DoS condition.
To exploit this vulnerability, the attacker may require access to trusted, internal networks. This access limitation could limit the likelihood of a successful exploit.
Cisco indicates through the CVSS score that proof-of-concept exploit code exists; however, the code is not known to be publicly available.
More information about XMPP stream headers is available in RFC 6120.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at firstname.lastname@example.org.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.