PT-2021-4045 · Cisco · Cisco Ios Xr

Published 2021-09-08 · Updated 2024-11-18 · CVE-2021-1440

Positive Technologies (AI Summary)

CVSS v3.1

6.8

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description A vulnerability in the implementation of the Resource Public Key Infrastructure (RPKI) feature could allow an unauthenticated, remote attacker to cause the Border Gateway Protocol (BGP) process to crash, resulting in a denial of service (DoS) condition. This is due to the incorrect handling of a specific RPKI to Router (RTR) Protocol packet header. An attacker could exploit this vulnerability by compromising the RPKI validator server and sending a specifically crafted RTR packet to an affected device, or by using man-in-the-middle techniques to impersonate the RPKI validator server and send a specifically crafted RTR response packet over the established RTR TCP connection to the affected device. A successful exploit could allow the attacker to cause a DoS condition because the BGP process could constantly restart and BGP routing could become unstable.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

BDU:2021-04573

CVE-2021-1440

Affected Products

Cisco Ios Xr

References · 9

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-sma-info-disclo-VOu2GHbZ · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04573 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-sigverbypass-gPYXd6Mk · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrbgp-rpki-dos-gvmjqxbk · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-1440 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-1440 · Security Note
• https://twitter.com/CVEnew/status/1858538981186843090 · Twitter Post
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrbgp-rpki-dos-gvmjqxbk?vsfCisco20Security20AdvisoryvscatSecurity20IntelligencevstypeRSSvspCisco20IOS20XR20Software20Border20Gateway20Protocol20Resource20Public20Key20Infrastructure20Denial20of20Service20Vulnerabilityvsk1 · Note