Cisco Security Advisory
Cisco IOS Real-time Transport Protocol Packet Processing Denial of Service Vulnerability
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AV:N/AC:M/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted device.
The vulnerability is due to errors in processing malformed packets. An unauthenticated, remote attacker could exploit the vulnerability by sending malicious network packets to a device. If successful, the attacker could cause components of the device to stop responding, resulting in a DoS condition.
Cisco has confirmed this vulnerability in a security advisory and has released updated software.
Only devices that use Gambino DSP components are vulnerable. Devices with different DSP components, or those without the component, are unaffected.
To exploit the vulnerability, an attacker must send malicious network requests to affected devices. Attackers may require access to internal networks to send RTP requests to a device, limiting the potential for exploitation.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Cisco confirmed the vulnerability in Cisco bug ID CSCsy52459 (registered users).
Vulnerable Products
Cisco IOS Software versions prior to 12.4(15)Tx that contain DSPware firmware versions prior to 9.4.14 are affected. More recent versions of Cisco IOS Software use DSP firmware version 10 and later, which do not contain the vulnerability.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate software updates.
Administrators may consider disabling RTP processing if the protocol is not required.
Administrators are advised to monitor critical systems.
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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 tac@cisco.com.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2011-Jun-10
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