#VU97204 Improper Verification of Source of a Communication Channel in Cisco IOS XR - CVE-2024-20390

Vulnerability identifier: #VU97204

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-20390

CWE-ID: CWE-940

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XR
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform DoS attack.

The vulnerability exists due to improper input validation of ingress XML packets in the Dedicated XML Agent feature. A remote attacker can send specially crafted packets to the XML TCP port 38751 and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 7.0 - 7.0.90, 7.1 - 7.11.2, 7.2.0 - 7.2.12, 7.3 - 7.3.15, 7.4 - 7.4.2, 7.5.0 - 7.5.4, 7.6.0 - 7.6.3, 7.7.0 - 7.7.21, 7.8 - 7.8.2, 7.9 - 7.9.21, 24.1 - 24.1.1

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External links
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-xml-tcpdos-ZEXvrU2S
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj39201

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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.