Vulnerability Alert

Cisco IOS Software Unified Communications Manager Express SCCP Request Handling Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:20070
Version:1
First Published:2010 March 24 16:09 GMT
Last Published:2010 March 24 16:09 GMT
Port: 2000
CVE:CVE-2010-0586
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:

Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are available.

 
 
Description

Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability exists due to errors in processing Skinny Client Control Protocol (SCCP) packets.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious request to the targeted device.  Successful exploitation could allow the attacker to cause the device to reload, resulting in a DoS condition.

Cisco has confirmed the vulnerability in a security advisory and released updated software.

 
Warning Indicators

Cisco has published a list of affected Cisco IOS Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.

 
IntelliShield Analysis

To exploit this vulnerability, an attacker may require access to internal networks.  The attacker must send requests to a targeted device from a registered IP address.  If the autoregistration feature is enabled, as it is by default, the attacker could register an IP address prior to exploitation.

If an exploit is successful, the attacker could cause the system to reload.  A stream of malicious packets could cause the device to reload as long as the stream continues.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.

 
Vendor Announcements

Cisco has released a security advisory for Cisco bug ID CSCsz49741 at the following link: cisco-sa-20100324-cucme

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to stop responding and reload, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to errors in processing SCCP packets.  The Unified Call Manager Express feature of Cisco IOS Software uses SCCP to support IP phones.  By default, devices accept SCCP packets on TCP port 2000, although the port is configurable.  Devices accept SCCP requests only from registered IP addresses; however, the autoregistration feature is enabled by default and could allow an attacker to register an IP address prior to an exploit.

An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious packet to the targeted device.  When processed, the packet could cause an error condition that causes the device to reload, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the available software updates.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

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 critical systems.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20100324-voice

 
Patches/Software

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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
24799/0Cisco IOS Malformed SCCP VulnerabilityS4792010 Mar 24 
Cisco Small Business IPS
Signature IDSignature NameReleaseLatest Release Date
SBIPS2010-000145/Cisco IOS Malformed SCCP VulnerabilitySBIPS0000052010 Jun 17 
 
Alert History
 

Initial Release



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
N/A

Associated Products:
CiscoIOS 12.4GC 12.4(22)GC1, 12.4(24)GC1 | 12.4MR 12.4(9)MR, 12.4(11)MR, 12.4(12)MR, 12.4(12)MR1, 12.4(12)MR2, 12.4(16)MR, 12.4(16)MR1, 12.4(16)MR2, 12.4(19)MR | 12.4T 12.4(9)T, 12.4(9)T0a, 12.4(9)T1, 12.4(9)T2, 12.4(9)T3, 12.4(9)T4, 12.4(9)T5, 12.4(9)T6, 12.4(9)T7, 12.4(11)T, 12.4(11)T1, 12.4(11)T2, 12.4(11)T3, 12.4(11)T4, 12.4(15)T, 12.4(15)T1, 12.4(15)T2, 12.4(15)T3, 12.4(15)T4, 12.4(15)T5, 12.4(15)T6, 12.4(15)T6a, 12.4(15)T7, 12.4(15)T8, 12.4(15)T9, 12.4(20)T, 12.4(20)T1, 12.4(20)T2, 12.4(20)T3, 12.4(22)T, 12.4(22)T1, 12.4(22)T2, 12.4(24)T, 12.4(24)T1 | 12.4XC 12.4(4)XC, 12.4(4)XC1, 12.4(4)XC2, 12.4(4)XC3, 12.4(4)XC4, 12.4(4)XC5, 12.4(4)XC6, 12.4(4)XC7 | 12.4XE 12.4(6)XE, 12.4(6)XE1, 12.4(6)XE2, 12.4(6)XE3 | 12.4XJ 12.4(11)XJ, 12.4(11)XJ1, 12.4(11)XJ2, 12.4(11)XJ3, 12.4(11)XJ4, 12.4(11)XJ5, 12.4(11)XJ6 | 12.4XL 12.4(15)XL, 12.4(15)XL1, 12.4(15)XL2, 12.4(15)XL3, 12.4(15)XL4, 12.4(15)XL5 | 12.4XM 12.4(15)XM1, 12.4(15)XM2 | 12.4XV 12.4(11)XV, 12.4(11)XV1 | 12.4XW 12.4(11)XW, 12.4(11)XW1, 12.4(11)XW10, 12.4(11)XW2, 12.4(11)XW3, 12.4(11)XW4, 12.4(11)XW5, 12.4(11)XW6, 12.4(11)XW7, 12.4(11)XW8, 12.4(11)XW9 | 12.4XY 12.4(15)XY, 12.4(15)XY1, 12.4(15)XY2, 12.4(15)XY3, 12.4(15)XY4, 12.4(15)XY5 | 12.4XZ 12.4(15)XZ, 12.4(15)XZ1, 12.4(15)XZ2 | 12.4YA 12.4(20)YA, 12.4(20)YA1, 12.4(20)YA2, 12.4(20)YA3 | 12.4YB 12.4(22)YB, 12.4(22)YB1




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