Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in the IP stack of the Cisco Packet Data Network Gateway (PGW) could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) of the Session Manager service when a malformed IP packet is received.
The vulnerability is due to improper input validation of certain fields in the IP packet. An attacker could exploit this vulnerability by crafting a malformed IP packet and sending it to the affected device. An exploit could allow the attacker to cause a DoS of the Session Manager service of the PGW.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker must be able to send malformed IP packets to the targeted device, making exploitation more difficult in environments that restrict network access from untrusted sources.
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 has released bug ID CSCut38476 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASR 5000 Series Software releases 15.0(912), 15.0(935), and 15.0(938) were vulnerable. Later releases of Cisco ASR 5000 Series Software may also be vulnerable.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 updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected 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 email 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 2015-Jul-14
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