Vulnerability identifier: #VU80766

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-38802

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
frr
Other software / Other software solutions

Vendor: frrouting.org

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when processing BGP update data with a corrupted attribute 23 (Tunnel Encapsulation). A remote attacker can send specially crafted BGP update data to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

frr: 7.5.1 - 9.0

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External links
http://news.ycombinator.com/item?id=37305800
http://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handling
http://www.debian.org/security/2023/dsa-5495
http://github.com/FRRouting/frr/releases/tag/frr-8.5.3
http://github.com/FRRouting/frr/releases/tag/frr-9.0.1

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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.