CVE-2017-16227

Publication date 29 October 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The aspath_put function in bgpd/bgp_aspath.c in Quagga before 1.2.2 allows remote attackers to cause a denial of service (session drop) via BGP UPDATE messages, because AS_PATH size calculation for long paths counts certain bytes twice and consequently constructs an invalid message.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
quagga	17.10 artful	Fixed 1.1.1-3ubuntu0.1
	17.04 zesty	Fixed 1.1.1-1ubuntu0.1
	16.04 LTS xenial	Fixed 0.99.24.1-2ubuntu1.3
	14.04 LTS trusty	Fixed 0.99.22.4-3ubuntu1.4

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
quagga	Upstream: ?id=7a4

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-3471-1
Quagga vulnerabilities
31 October 2017