Vulnerability Description
With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection to a server could consume more resources than the server has been provisioned to handle. When a TCP connection with a large number of pipelined queries is closed, the load on the server releasing these multiple resources can cause it to become unresponsive, even for queries that can be answered authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem).
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Isc | Bind | >= 9.11.7, <= 9.11.12 |
| Fedoraproject | Fedora | 30 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
- https://kb.isc.org/docs/cve-2019-6477Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://support.f5.com/csp/article/K15840535?utm_source=f5support&%3Butm_medi
- https://www.debian.org/security/2020/dsa-4689
- https://www.synology.com/security/advisory/Synology_SA_19_39Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
- https://kb.isc.org/docs/cve-2019-6477Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://support.f5.com/csp/article/K15840535?utm_source=f5support&%3Butm_medi
- https://www.debian.org/security/2020/dsa-4689
FAQ
What is CVE-2019-6477?
CVE-2019-6477 is a vulnerability with a CVSS score of 7.5 (HIGH). With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined...
How severe is CVE-2019-6477?
CVE-2019-6477 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-6477?
Check the references section above for vendor advisories and patch information. Affected products include: Isc Bind, Fedoraproject Fedora.