Description
The BGP implementation in bgpd in Quagga before 0.99.20.1 does not properly use message buffers for OPEN messages, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a message associated with a malformed Four-octet AS Number Capability (aka AS4 capability).
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | quagga | 0.99.20.1-0+squeeze1 | DSA-2459-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | quagga +2 | 0.99.15-7.el6_3.2 | RHSA-2012:1259 |
Advisories 2
- RHSA-2012:1259 Red Hat Security Advisory: quagga security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2459-1 quagga - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- RHSA-2012:1259 vendor-advisory
- FEDORA-2012-5411 vendor-advisory
- DSA-2459 vendor-advisory
- VU#551715 third-party-advisory
- 48949 third-party-advisory
- FEDORA-2012-5436 vendor-advisory
- FEDORA-2012-5352 vendor-advisory