CVE-2018-5381 Denial of service in bgpd

What is CVE-2018-5381?

CVE-2018-5381 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 19 Feb 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Quagga BGP daemon (bgpd) prior to version 1.2.3 has a bug in its parsing of "Capabilities" in BGP OPEN messages, in the bgp_packet.c:bgp_capability_msg_parse function. The parser can enter an infinite loop on invalid capabilities if a Multi-Protocol capability does not have a recognized AFI/SAFI, causing a denial of service.

Weakness: CWE-835, CWE-228

Which versions are affected by CVE-2018-5381?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Quagga Quagga, Siemens Ruggedcom Rox Ii Firmware.

How do I fix CVE-2018-5381?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-5381 being exploited?

There is no known exploitation of CVE-2018-5381 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLSA-2026-1777946639, CLSA-2026-1778170790, CVE-2018-1000065, GHSA-g4qp-j7fc-2xcf, UBUNTU-CVE-2018-5381.