#VU21407 Stack-based buffer overflow in BIRD Internet Routing Daemon - CVE-2019-16159

Vulnerability identifier: #VU21407

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-16159

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIRD Internet Routing Daemon
Server applications / Other server solutions

Vendor: CZ.NIC Labs

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system or perform denial of service attack.

The vulnerability exists due to a boundary error when checking validity of BGP administrative shutdown communication messages. A remote unauthenticated attacker can send a specially crafted administrative shutdown communication message, trigger a four-byte stack-based buffer overflow and perform denial of service attack or execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIRD Internet Routing Daemon: 1.6.0 - 2.0.5

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External links
https://bird.network.cz
https://trubka.network.cz/pipermail/bird-users/2019-September/013718.html
https://trubka.network.cz/pipermail/bird-users/2019-September/013720.html
https://trubka.network.cz/pipermail/bird-users/2019-September/013722.html
https://gitlab.labs.nic.cz/labs/bird/commit/1657c41c96b3c07d9265b07dd4912033ead4124b
https://gitlab.labs.nic.cz/labs/bird/commit/8388f5a7e14108a1458fea35bfbb5a453e2c563c

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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.