Multiple vulnerabilities in Cisco IOS XR



Published: 2020-01-24
Risk High
Patch available NO
Number of vulnerabilities 7
CVE-ID CVE-2019-15989
CVE-2019-16023
CVE-2019-16022
CVE-2019-16021
CVE-2019-16020
CVE-2019-16019
CVE-2019-16018
CWE-ID CWE-754
CWE-399
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Cisco IOS XR
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Improper Check for Unusual or Exceptional Conditions

EUVDB-ID: #VU24524

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-15989

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of a Border Gateway Protocol (BGP) update message that contains a specific BGP attribute. A remote attacker can send specially crafted Border Gateway Protocol Attribute update messages and cause the BGP process to restart unexpectedly, resulting in a DoS condition.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource management error

EUVDB-ID: #VU24522

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16023

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Mcast Join Originator Router Address update messages with Length parameter and perform a denial of service attack.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Resource management error

EUVDB-ID: #VU24521

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16022

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Multicast Join Nonstandard Group update messages with Length parameter and perform a denial of service attack.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Resource management error

EUVDB-ID: #VU24520

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16021

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Multicast Leave Source update messages and perform a denial of service attack.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Resource management error

EUVDB-ID: #VU24519

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16020

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Multicast Leave update messages and perform a denial of service attack.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Resource management error

EUVDB-ID: #VU24518

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16019

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted BGP EVPN Multicast Join Group update messages with length set to zero and perform a denial of service attack.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

7) Resource management error

EUVDB-ID: #VU24517

Risk: Medium

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16018

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of a Border Gateway Protocol (BGP) update message that contains crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Mcast Join in RR/ASBR/Retain Route target message, wait for a user on the device to display the EVPN operational routes’ status and cause the BGP process to restart unexpectedly, resulting in a DoS condition.

Mitigation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

Vulnerable software versions

Cisco IOS XR: 6.6.1 - 7.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-routes


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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