Resource exhaustion in Isc Bind
CVE-2023-6516
To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Isc Bind — versions 9.16.8, 9.16.11, 9.16.12
- Isc Bind 9 — versions 9.16.0, 9.16.8-S1
- NetApp Active Iq Unified Manager
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.isc.org/docs/cve-2023-6516 (vendor-advisory, Vendor Advisory)
- www.openwall.com/lists/oss-security/2024/02/13/1 (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20240503-0008/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-6516?
- CVE-2023-6516 is a high-severity vulnerability in Isc Bind, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2024-02-13.
- How severe is CVE-2023-6516?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-6516 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.