Detections
Analytics
Cisco IOS XR Software IP Service Level Agreements Two Way Active Measurement Protocol DoS (cisco-sa-ipsla-ZA3SRrpP)
high Nessus Plugin ID 153206
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Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco IOS XR is affected by a vulnerability in the IP Service Level Agreements (IP SLA) responder and Two-Way Active Measurement Protocol (TWAMP) features that allows an unauthenticated, remote attacker to cause device packet memory to become exhausted or cause the IP SLA process to crash, resulting in a denial of service (DoS) condition. This vulnerability exists because socket creation failures are mishandled during the IP SLA and TWAMP processes. An attacker could exploit this vulnerability by sending specific IP SLA or TWAMP packets to an affected device. A successful exploit could allow the attacker to exhaust the packet memory, which will impact other processes, such as routing protocols, or crash the IP SLA process.Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvw32825, CSCvw61840See Also
http://www.nessus.org/u?8c47a1c9
http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74637
Plugin Details
Severity: High
ID: 153206
File Name: cisco-sa-ipsla-ZA3SRrpP-iosxr.nasl
Version: 1.7
Type: combined
Family: CISCO
Published: 9/10/2021
Updated: 4/22/2022
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.2
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2021-34720
CVSS v3
Risk Factor: High
Base Score: 8.6
Temporal Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:cisco:ios_xr
Required KB Items: Host/Cisco/IOS-XR/Version
Exploit Ease: No known exploits are available
Patch Publication Date: 9/8/2021
Vulnerability Publication Date: 9/8/2021
Reference Information
CVE: CVE-2021-34720