#VU10654 Denial of service in Quagga - CVE-2017-16227

Vulnerability identifier: #VU10654

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-16227

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Quagga
Server applications / Other server solutions

Vendor: quagga.net

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the Quagga BGP daemon due to AS_PATH size calculation for long paths counts certain bytes twice and consequently constructs an invalid message. A remote attacker can іsupply specially crafted BGP UPDATE messages and cause session drop.

Mitigation
Update to version 1.2.2.

Vulnerable software versions

Quagga: 1.0.20160309 - 1.2.1

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External links
https://git.savannah.gnu.org/cgit/quagga.git/commit/?id=7a42b78be9a4108d98833069a88e6fddb9285008

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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.