ISS X-Force Database: cisco-ios-telnet-dos(17131): Cisco IOS Telnet denial of service

Cisco IOS Telnet denial of service

cisco-ios-telnet-dos (17131)

Medium Risk

Description:

Cisco devices are vulnerable to a denial of service attack. If the device is enabled for access via Telnet or reverse Telnet, a remote attacker could send a specially-crafted connection to a Telnet or reverse Telnet port to possibly block further access attempts by Telnet, reverse Telnet, Remote Shell (RSH), Secure Shell (SSH), and possibly Hypertext Transport Protocol (HTTP) access to the Cisco device.

Note: Prior Telnet, reverse Telnet, RSH, SSH, SCP and HTTP sessions that were already established will continue to function properly. Remote access services that use virtual terminals (VTY) are affected.

Consequences:

Denial of Service

Remedy:

No remedy available as of October 23, 2008.

References:

CIAC Information Bulletin 0-207: Cisco IOS Telnet Denial of Service Vulnerability.
Cisco Security Advisory 2004 August 27 1000 UTC: Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability.
BID-11060: Cisco IOS Telnet Service Remote Denial of Service Vulnerability
CVE-2004-1464: Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.
SA12395: Cisco IOS Telnet Service Denial of Service Vulnerability
SECTRACK ID: 1011079: Cisco IOS Telnet and Reverse Telnet TCP Bug Lets Remote Users Deny Subsequent Management Terminal Connections
US-CERT VU#384230: Cisco IOS fails to properly handle telnet connections

Platforms Affected:

Cisco IOS 12.2
Cisco IOS 12.2(1)
Cisco IOS 12.2(1)DX
Cisco IOS 12.2(1)S
Cisco IOS 12.2(1)T
Cisco IOS 12.2(1)XA
Cisco IOS 12.2(1)XD
Cisco IOS 12.2(1)XD1
Cisco IOS 12.2(1)XD3
Cisco IOS 12.2(1)XD4
Cisco IOS 12.2(1)XE
Cisco IOS 12.2(1)XE2
Cisco IOS 12.2(1)XE3
Cisco IOS 12.2(1)XH
Cisco IOS 12.2(1)XQ
Cisco IOS 12.2(1)XS
Cisco IOS 12.2(1)XS1
Cisco IOS 12.2(1.1)
Cisco IOS 12.2(1.1)PI
Cisco IOS 12.2(1.4)S
Cisco IOS 12.2(10)DA2
Cisco IOS 12.2(10G)
Cisco IOS 12.2(11)BC3C
Cisco IOS 12.2(11)JA
Cisco IOS 12.2(11)JA1
Cisco IOS 12.2(11)T
Cisco IOS 12.2(11)T2
Cisco IOS 12.2(11)T3
Cisco IOS 12.2(11)T8
Cisco IOS 12.2(11)T9
Cisco IOS 12.2(11)YP1
Cisco IOS 12.2(11)YU
Cisco IOS 12.2(11)YV
Cisco IOS 12.2(11)YX1
Cisco IOS 12.2(11)YZ2
Cisco IOS 12.2(12)
Cisco IOS 12.2(12)2XU
Cisco IOS 12.2(12)DA3
Cisco IOS 12.2(12.02)S
Cisco IOS 12.2(12.02)T
Cisco IOS 12.2(12.05)
Cisco IOS 12.2(12.05)S
Cisco IOS 12.2(12.05)T
Cisco IOS 12.2(12B)
Cisco IOS 12.2(12C)
Cisco IOS 12.2(12G)
Cisco IOS 12.2(12H)
Cisco IOS 12.2(12I)
Cisco IOS 12.2(13)
Cisco IOS 12.2(13)JA1
Cisco IOS 12.2(13)MC1
Cisco IOS 12.2(13)T
Cisco IOS 12.2(13)T1
Cisco IOS 12.2(13)T9
Cisco IOS 12.2(13)ZC
Cisco IOS 12.2(13)ZD
Cisco IOS 12.2(13)ZE
Cisco IOS 12.2(13)ZF
Cisco IOS 12.2(13)ZG
Cisco IOS 12.2(13)ZH
Cisco IOS 12.2(13)ZH3
Cisco IOS 12.2(13)ZJ
Cisco IOS 12.2(13)ZK
Cisco IOS 12.2(13)ZL
Cisco IOS 12.2(13.03)B
Cisco IOS 12.2(13A)
Cisco IOS 12.2(13E)
Cisco IOS 12.2(14)S
Cisco IOS 12.2(14)SX1
Cisco IOS 12.2(14)SY
Cisco IOS 12.2(14)SY03
Cisco IOS 12.2(14)SY1
Cisco IOS 12.2(14)SZ
Cisco IOS 12.2(14)SZ1
Cisco IOS 12.2(14)SZ2
Cisco IOS 12.2(14)ZA
Cisco IOS 12.2(14)ZA2
Cisco IOS 12.2(14)ZA8
Cisco IOS 12.2(14.5)
Cisco IOS 12.2(14.5)T
Cisco IOS 12.2(15)B
Cisco IOS 12.2(15)BC
Cisco IOS 12.2(15)BC1
Cisco IOS 12.2(15)BX
Cisco IOS 12.2(15)BZ
Cisco IOS 12.2(15)CX
Cisco IOS 12.2(15)MC1
Cisco IOS 12.2(15)SL1
Cisco IOS 12.2(15)T
Cisco IOS 12.2(15)T5
Cisco IOS 12.2(15)T7
Cisco IOS 12.2(15)T8
Cisco IOS 12.2(15)T9
Cisco IOS 12.2(15)YS_1.2(1)
Cisco IOS 12.2(15)ZJ
Cisco IOS 12.2(15)ZJ1
Cisco IOS 12.2(15)ZJ2
Cisco IOS 12.2(15)ZJ3
Cisco IOS 12.2(15)ZK
Cisco IOS 12.2(15)ZL
Cisco IOS 12.2(15)ZL1
Cisco IOS 12.2(15)ZN
Cisco IOS 12.2(15)ZO
Cisco IOS 12.2(15.1)S
Cisco IOS 12.2(16)B
Cisco IOS 12.2(16)B1
Cisco IOS 12.2(16)BX
Cisco IOS 12.2(16.1)B
Cisco IOS 12.2(16.5)S
Cisco IOS 12.2(16F)
Cisco IOS 12.2(17)
Cisco IOS 12.2(17)A
Cisco IOS 12.2(17A)
Cisco IOS 12.2(17A)SXA
Cisco IOS 12.2(17B)SXA
Cisco IOS 12.2(17D)
Cisco IOS 12.2(17D)SXB
Cisco IOS 12.2(18)EW
Cisco IOS 12.2(18)S
Cisco IOS 12.2(18)SE
Cisco IOS 12.2(18)SV
Cisco IOS 12.2(18)SW
Cisco IOS 12.2(18.2)
Cisco IOS 12.2(19)
Cisco IOS 12.2(19)B
Cisco IOS 12.2(1B)
Cisco IOS 12.2(1B)DA1
Cisco IOS 12.2(1D)
Cisco IOS 12.2(2)B
Cisco IOS 12.2(2)BX
Cisco IOS 12.2(2)BY
Cisco IOS 12.2(2)BY2
Cisco IOS 12.2(2)DD3
Cisco IOS 12.2(2)T
Cisco IOS 12.2(2)T1
Cisco IOS 12.2(2)T4
Cisco IOS 12.2(2)XA
Cisco IOS 12.2(2)XA1
Cisco IOS 12.2(2)XA5
Cisco IOS 12.2(2)XB
Cisco IOS 12.2(2)XB11
Cisco IOS 12.2(2)XB14
Cisco IOS 12.2(2)XB15
Cisco IOS 12.2(2)XB3
Cisco IOS 12.2(2)XB4
Cisco IOS 12.2(2)XC1
Cisco IOS 12.2(2)XF
Cisco IOS 12.2(2)XG
Cisco IOS 12.2(2)XH
Cisco IOS 12.2(2)XH2
Cisco IOS 12.2(2)XH3
Cisco IOS 12.2(2)XI
Cisco IOS 12.2(2)XI1
Cisco IOS 12.2(2)XI2
Cisco IOS 12.2(2)XJ
Cisco IOS 12.2(2)XJ1
Cisco IOS 12.2(2)XK
Cisco IOS 12.2(2)XK2
Cisco IOS 12.2(2)XN
Cisco IOS 12.2(2)XT
Cisco IOS 12.2(2)XT3
Cisco IOS 12.2(2)XU
Cisco IOS 12.2(2)XU2
Cisco IOS 12.2(2)YC
Cisco IOS 12.2(2.2)T
Cisco IOS 12.2(20)S
Cisco IOS 12.2(20)S1
Cisco IOS 12.2(20)S2
Cisco IOS 12.2(21)
Cisco IOS 12.2(21A)
Cisco IOS 12.2(21B)
Cisco IOS 12.2(22)S
Cisco IOS 12.2(23)
Cisco IOS 12.2(23)SW
Cisco IOS 12.2(23.6)
Cisco IOS 12.2(23A)
Cisco IOS 12.2(24)
Cisco IOS 12.2(3)
Cisco IOS 12.2(3.4)BP
Cisco IOS 12.2(3D)
Cisco IOS 12.2(4)
Cisco IOS 12.2(4)B
Cisco IOS 12.2(4)B1
Cisco IOS 12.2(4)B2
Cisco IOS 12.2(4)B3
Cisco IOS 12.2(4)B4
Cisco IOS 12.2(4)BC1
Cisco IOS 12.2(4)BC1A
Cisco IOS 12.2(4)BX
Cisco IOS 12.2(4)JA
Cisco IOS 12.2(4)JA1
Cisco IOS 12.2(4)MB12
Cisco IOS 12.2(4)MB3
Cisco IOS 12.2(4)MX
Cisco IOS 12.2(4)MX1
Cisco IOS 12.2(4)T
Cisco IOS 12.2(4)T1
Cisco IOS 12.2(4)T3
Cisco IOS 12.2(4)T6
Cisco IOS 12.2(4)XL
Cisco IOS 12.2(4)XL4
Cisco IOS 12.2(4)XM
Cisco IOS 12.2(4)XM2
Cisco IOS 12.2(4)XW
Cisco IOS 12.2(4)XW1
Cisco IOS 12.2(4)YA
Cisco IOS 12.2(4)YA1
Cisco IOS 12.2(4)YA7
Cisco IOS 12.2(4)YA8
Cisco IOS 12.2(4)YB
Cisco IOS 12.2(5)
Cisco IOS 12.2(5)CA1
Cisco IOS 12.2(5D)
Cisco IOS 12.2(6.8)T0A
Cisco IOS 12.2(6.8)T1A
Cisco IOS 12.2(6C)
Cisco IOS 12.2(7)
Cisco IOS 12.2(7)DA
Cisco IOS 12.2(7.4)S
Cisco IOS 12.2(7A)
Cisco IOS 12.2(7B)
Cisco IOS 12.2(8)BC1
Cisco IOS 12.2(8)JA
Cisco IOS 12.2(8)T
Cisco IOS 12.2(8)T10
Cisco IOS 12.2(8)YD
Cisco IOS 12.2(8)YW2
Cisco IOS 12.2(8)YW3
Cisco IOS 12.2(8)YY
Cisco IOS 12.2(8)YY3
Cisco IOS 12.2(8)ZB7
Cisco IOS 12.2(9)S
Cisco IOS 12.2B
Cisco IOS 12.2BC
Cisco IOS 12.2BW
Cisco IOS 12.2BX
Cisco IOS 12.2BY
Cisco IOS 12.2BZ
Cisco IOS 12.2CX
Cisco IOS 12.2CY
Cisco IOS 12.2DA
Cisco IOS 12.2DD
Cisco IOS 12.2DX
Cisco IOS 12.2EW
Cisco IOS 12.2JA
Cisco IOS 12.2JK
Cisco IOS 12.2MB
Cisco IOS 12.2MC
Cisco IOS 12.2MX
Cisco IOS 12.2PB
Cisco IOS 12.2PI
Cisco IOS 12.2S
Cisco IOS 12.2SA
Cisco IOS 12.2SE
Cisco IOS 12.2SU
Cisco IOS 12.2SV
Cisco IOS 12.2SW
Cisco IOS 12.2SX
Cisco IOS 12.2SXA
Cisco IOS 12.2SXB
Cisco IOS 12.2SXD
Cisco IOS 12.2SY
Cisco IOS 12.2SZ
Cisco IOS 12.2T
Cisco IOS 12.2XA
Cisco IOS 12.2XB
Cisco IOS 12.2XB15
Cisco IOS 12.2XC
Cisco IOS 12.2XD
Cisco IOS 12.2XE
Cisco IOS 12.2XF
Cisco IOS 12.2XG
Cisco IOS 12.2XH
Cisco IOS 12.2XI
Cisco IOS 12.2XJ
Cisco IOS 12.2XK
Cisco IOS 12.2XL
Cisco IOS 12.2XM
Cisco IOS 12.2XN
Cisco IOS 12.2XQ
Cisco IOS 12.2XR
Cisco IOS 12.2XS
Cisco IOS 12.2XT
Cisco IOS 12.2XU
Cisco IOS 12.2XW
Cisco IOS 12.2YA
Cisco IOS 12.2YB
Cisco IOS 12.2YC
Cisco IOS 12.2YD
Cisco IOS 12.2YE
Cisco IOS 12.2YF
Cisco IOS 12.2YG
Cisco IOS 12.2YH
Cisco IOS 12.2YJ
Cisco IOS 12.2YK
Cisco IOS 12.2YL
Cisco IOS 12.2YM
Cisco IOS 12.2YN
Cisco IOS 12.2YO
Cisco IOS 12.2YP
Cisco IOS 12.2YQ
Cisco IOS 12.2YR
Cisco IOS 12.2YS
Cisco IOS 12.2YT
Cisco IOS 12.2YU
Cisco IOS 12.2YV
Cisco IOS 12.2YW
Cisco IOS 12.2YX
Cisco IOS 12.2YY
Cisco IOS 12.2YZ
Cisco IOS 12.2ZA
Cisco IOS 12.2ZB
Cisco IOS 12.2ZC
Cisco IOS 12.2ZD
Cisco IOS 12.2ZE
Cisco IOS 12.2ZF
Cisco IOS 12.2ZG
Cisco IOS 12.2ZH
Cisco IOS 12.2ZI
Cisco IOS 12.2ZJ
Cisco IOS 12.2ZK
Cisco IOS 12.2ZL
Cisco IOS 12.2ZN
Cisco IOS 12.2ZO
Cisco IOS 12.2ZP
Cisco IOS 12.2ZQ
Cisco IOS 12.3
Cisco IOS 12.3(1A)
Cisco IOS 12.3(2)T3
Cisco IOS 12.3(2)XC1
Cisco IOS 12.3(2)XC2
Cisco IOS 12.3(2)XC3
Cisco IOS 12.3(3E)
Cisco IOS 12.3(4)EO1
Cisco IOS 12.3(4)T
Cisco IOS 12.3(4)T1
Cisco IOS 12.3(4)T2
Cisco IOS 12.3(4)T3
Cisco IOS 12.3(4)T4
Cisco IOS 12.3(4)XD
Cisco IOS 12.3(4)XD1
Cisco IOS 12.3(4)XD2
Cisco IOS 12.3(4)XG1
Cisco IOS 12.3(4)XH
Cisco IOS 12.3(4)XK
Cisco IOS 12.3(4)XQ
Cisco IOS 12.3(5)
Cisco IOS 12.3(5)B1
Cisco IOS 12.3(5A)
Cisco IOS 12.3(5A)B
Cisco IOS 12.3(5B)
Cisco IOS 12.3(5C)
Cisco IOS 12.3(6)
Cisco IOS 12.3(6A)
Cisco IOS 12.3(7)T
Cisco IOS 12.3(7.7)
Cisco IOS 12.3(9)
Cisco IOS 12.3B
Cisco IOS 12.3BC
Cisco IOS 12.3BW
Cisco IOS 12.3JA
Cisco IOS 12.3T
Cisco IOS 12.3XA
Cisco IOS 12.3XB
Cisco IOS 12.3XC
Cisco IOS 12.3XD
Cisco IOS 12.3XE
Cisco IOS 12.3XF
Cisco IOS 12.3XG
Cisco IOS 12.3XH
Cisco IOS 12.3XI
Cisco IOS 12.3XJ
Cisco IOS 12.3XK
Cisco IOS 12.3XL
Cisco IOS 12.3XM
Cisco IOS 12.3XN
Cisco IOS 12.3XQ
Cisco IOS 12.3XR
Cisco IOS 12.3XT
Cisco IOS 12.3XU
Cisco IOS 12.3YD

Reported:

Aug 27, 2004

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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