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Vulnerability Alert

Cisco IOS Software Protocol Translation Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:28649
Version:1
First Published:2013 March 27 16:07 GMT
Last Published:2013 March 27 16:07 GMT
Port: Not available
CVE:CVE-2013-1147
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 is due to insufficient validation of TCP connection information when a vulnerable protocol translation configuration in the affected software is in use. An attacker could exploit this vulnerability by trying to connect to the affected protocol translation resource on the affected device. An exploit could allow the attacker to cause a reload of the affected device.

Cisco confirmed the vulnerability in a security advisory and released updated software.
 
Warning Indicators
Cisco devices running an affected version of Cisco IOS Software and have either a vulnerable protocol translation configuration or a Telnet-to-PAD protocol translation ruleset configured are affected.

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
It is likely that an attacker would need to have access to an internal, private network behind a firewall in order to connect to the affected translation feature on the affected device. This requirement may limit the possibility of a potential attack.

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 CSCtz35999 at the following link: cisco-sa-20130327-pt
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to reload. Repeated exploitation could result in a sustained DoS condition.
 
Technical Information
The vulnerability is due to insufficient validation of TCP connection information when the protocol translation feature is used by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by trying to connect to the affected protocol translation resource on the affected device. Successful exploitation could allow the attacker to cause a reload of the affected device, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

Administrators may consider changing the default incoming connection port number to be any suitable value other than port 23.

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: Identifying and Mitigating Exploitation of the Cisco IOS Software Protocol Translation Vulnerability

Administrators are advised to monitor affected systems.
 
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.
 
Alert History
 
Initial Release


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

Primary Products:
N/A

Associated Products:
CiscoIOS 12.3T 12.3(8)T, 12.3(8)T1, 12.3(8)T10, 12.3(8)T11, 12.3(8)T2, 12.3(8)T3, 12.3(8)T4, 12.3(8)T5, 12.3(8)T6, 12.3(8)T7, 12.3(8)T8, 12.3(8)T9, 12.3(11)T, 12.3(11)T1, 12.3(11)T10, 12.3(11)T11, 12.3(11)T12, 12.3(11)T2, 12.3(11)T2a, 12.3(11)T3, 12.3(11)T4, 12.3(11)T5, 12.3(11)T6, 12.3(11)T7, 12.3(11)T8, 12.3(11)T9, 12.3(14)T, 12.3(14)T1, 12.3(14)T2, 12.3(14)T3, 12.3(14)T4, 12.3(14)T5, 12.3(14)T6, 12.3(14)T7 | 12.3TO 12.3(11)TO3 | 12.3XL 12.3(11)XL, 12.3(11)XL1, 12.3(11)XL2, 12.3(11)XL3 | 12.3XM 12.3(7)XM | 12.3XR 12.3(7)XR1, 12.3(7)XR2, 12.3(7)XR3, 12.3(7)XR5, 12.3(7)XR6, 12.3(7)XR7 | 12.3XW 12.3(8)XW, 12.3(8)XW1, 12.3(8)XW1a, 12.3(8)XW2, 12.3(8)XW3 | 12.3XX 12.3(8)XX2d, 12.3(8)XX2e | 12.3YA 12.3(8)YA, 12.3(8)YA1 | 12.3YC 12.3(8)YC, 12.3(8)YC1, 12.3(8)YC2, 12.3(8)YC3 | 12.3YF 12.3(11)YF | 12.3YG 12.3(8)YG, 12.3(8)YG1, 12.3(8)YG2, 12.3(8)YG3, 12.3(8)YG4, 12.3(8)YG5, 12.3(8)YG6, 12.3(8)YG7 | 12.3YH 12.3(8)YH | 12.3YI 12.3(8)YI, 12.3(8)YI1, 12.3(8)YI2, 12.3(8)YI3 | 12.3YK 12.3(11)YK, 12.3(11)YK1, 12.3(11)YK2, 12.3(11)YK3 | 12.3YM 12.3(14)YM11 | 12.3YN 12.3(11)YN | 12.3YS 12.3(11)YS, 12.3(11)YS1, 12.3(11)YS2 | 12.3YT 12.3(14)YT, 12.3(14)YT1 | 12.3YU 12.3(14)YU1 | 12.3YX 12.3(14)YX4, 12.3(14)YX9 | 12.3YZ 12.3(11)YZ, 12.3(11)YZ1, 12.3(11)YZ2 | 12.3ZA 12.3(8)ZA, 12.3(8)ZA1 | 12.3ZB 12.3(11)ZB, 12.3(11)ZB1, 12.3(11)ZB2 | 12.4 12.4(1), 12.4(1a), 12.4(1b), 12.4(1c), 12.4(3), 12.4(3a), 12.4(3b), 12.4(3c), 12.4(3d), 12.4(3e), 12.4(3f), 12.4(3g), 12.4(3h), 12.4(3i), 12.4(3j), 12.4(5), 12.4(5a), 12.4(5b), 12.4(5c), 12.4(7), 12.4(7a), 12.4(7b), 12.4(7c), 12.4(7d), 12.4(7e), 12.4(7f), 12.4(7g), 12.4(7h), 12.4(8), 12.4(8a), 12.4(8b), 12.4(8c), 12.4(8d), 12.4(10), 12.4(10a), 12.4(10b), 12.4(10c), 12.4(12), 12.4(12a), 12.4(12b), 12.4(12c), 12.4(13), 12.4(13a), 12.4(13b), 12.4(13c), 12.4(13d), 12.4(13e), 12.4(13f), 12.4(16), 12.4(16a), 12.4(16b), 12.4(17), 12.4(17a), 12.4(17b), 12.4(18), 12.4(18a), 12.4(18b), 12.4(18c), 12.4(18d), 12.4(18e), 12.4(19), 12.4(21), 12.4(21a), 12.4(23), 12.4(23a), 12.4(23b), 12.4(23c), 12.4(23d), 12.4(23e), 12.4(25), 12.4(25a), 12.4(25b), 12.4(25c), 12.4(25d), 12.4(25e), 12.4(25f), 12.4(25g) | 12.4GC 12.4(22)GC1, 12.4(22)GC1a, 12.4(24)GC1, 12.4(24)GC3, 12.4(24)GC3a, 12.4(24)GC4, 12.4(24)GC5 | 12.4M 12.4(5a)M0, 12.4(21a)M1, 12.4(23b)M1 | 12.4MR 12.4(12)MR2, 12.4(16)MR, 12.4(16)MR1, 12.4(16)MR2, 12.4(19)MR, 12.4(19)MR1, 12.4(19)MR2, 12.4(20)MR, 12.4(20)MR2 | 12.4MRA 12.4(20)MRA, 12.4(20)MRA1 | 12.4MRB 12.4(20)MRB, 12.4(20)MRB1 | 12.4SW 12.4(11)SW, 12.4(11)SW1, 12.4(11)SW2, 12.4(11)SW3, 12.4(15)SW, 12.4(15)SW1, 12.4(15)SW2, 12.4(15)SW3, 12.4(15)SW4, 12.4(15)SW5, 12.4(15)SW6, 12.4(15)SW7, 12.4(15)SW8, 12.4(15)SW8a, 12.4(15)SW9 | 12.4T 12.4(2)T, 12.4(2)T1, 12.4(2)T2, 12.4(2)T3, 12.4(2)T4, 12.4(2)T5, 12.4(2)T6, 12.4(4)T, 12.4(4)T1, 12.4(4)T2, 12.4(4)T3, 12.4(4)T4, 12.4(4)T5, 12.4(4)T6, 12.4(4)T7, 12.4(4)T8, 12.4(6)T, 12.4(6)T1, 12.4(6)T10, 12.4(6)T11, 12.4(6)T12, 12.4(6)T2, 12.4(6)T3, 12.4(6)T4, 12.4(6)T5, 12.4(6)T5a, 12.4(6)T5b, 12.4(6)T5c, 12.4(6)T5d, 12.4(6)T5e, 12.4(6)T5f, 12.4(6)T6, 12.4(6)T7, 12.4(6)T8, 12.4(6)T9, 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)T10, 12.4(15)T11, 12.4(15)T12, 12.4(15)T13, 12.4(15)T13b, 12.4(15)T14, 12.4(15)T15, 12.4(15)T16, 12.4(15)T17, 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(20)T4, 12.4(20)T5, 12.4(20)T5a, 12.4(20)T6, 12.4(22)T, 12.4(22)T1, 12.4(22)T2, 12.4(22)T3, 12.4(22)T4, 12.4(22)T5, 12.4(24)T, 12.4(24)T1, 12.4(24)T2, 12.4(24)T3, 12.4(24)T4, 12.4(24)T5, 12.4(24)T6, 12.4(24)T7, 12.4(24)T8 | 12.4XA 12.4(2)XA, 12.4(2)XA1, 12.4(2)XA2 | 12.4XB 12.4(2)XB6 | 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 | 12.4XD 12.4(4)XD, 12.4(4)XD1, 12.4(4)XD10, 12.4(4)XD11, 12.4(4)XD12, 12.4(4)XD2, 12.4(4)XD3, 12.4(4)XD4, 12.4(4)XD5, 12.4(4)XD6, 12.4(4)XD7, 12.4(4)XD8, 12.4(4)XD9 | 12.4XE 12.4(6)XE, 12.4(6)XE1, 12.4(6)XE2, 12.4(6)XE3 | 12.4XG 12.4(9)XG2 | 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 | 12.4XK 12.4(14)XK | 12.4XT 12.4(6)XT, 12.4(6)XT1, 12.4(6)XT2 | 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, 12.4(22)YB4, 12.4(22)YB5, 12.4(22)YB6, 12.4(22)YB7, 12.4(22)YB8 | 15.0M 15.0(1)M, 15.0(1)M1, 15.0(1)M2, 15.0(1)M3, 15.0(1)M4, 15.0(1)M5, 15.0(1)M6, 15.0(1)M6a, 15.0(1)M7, 15.0(1)M8, 15.0(1)M9 | 15.0XA 15.0(1)XA, 15.0(1)XA1, 15.0(1)XA2, 15.0(1)XA3, 15.0(1)XA4, 15.0(1)XA5 | 15.1GC 15.1(2)GC, 15.1(2)GC1, 15.1(2)GC2, 15.1(4)GC | 15.1M 15.1(4)M, 15.1(4)M0a, 15.1(4)M0b, 15.1(4)M1, 15.1(4)M2, 15.1(4)M3, 15.1(4)M3a, 15.1(4)M4, 15.1(4)M5 | 15.1T 15.1(1)T, 15.1(1)T1, 15.1(1)T2, 15.1(1)T3, 15.1(1)T4, 15.1(1)T5, 15.1(2)T, 15.1(2)T0a, 15.1(2)T1, 15.1(2)T2, 15.1(2)T2a, 15.1(2)T3, 15.1(2)T4, 15.1(2)T5, 15.1(3)T, 15.1(3)T1, 15.1(3)T2, 15.1(3)T3, 15.1(3)T4 | 15.1XB 15.1(1)XB, 15.1(1)XB1, 15.1(1)XB2, 15.1(1)XB3, 15.1(4)XB4, 15.1(4)XB5, 15.1(4)XB5a, 15.1(4)XB6, 15.1(4)XB7, 15.1(4)XB8a | 15.2GC 15.2(1)GC, 15.2(1)GC1, 15.2(1)GC2, 15.2(2)GC, 15.2(3)GC | 15.2GCA 15.2(3)GCA | 15.2JA 15.2(2)JA, 15.2(2a)JA | 15.2M 15.2(4)M, 15.2(4)M1, 15.2(4)M2 | 15.2T 15.2(1)T, 15.2(1)T1, 15.2(1)T2, 15.2(1)T3, 15.2(1)T3a, 15.2(2)T, 15.2(2)T1, 15.2(2)T2, 15.2(3)T, 15.2(3)T1, 15.2(3)T2 | 15.2XB 15.2(4)XB10 | 15.3T 15.3(1)T




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