CVE-2022-38177: Memory leak in ECDSA DNSSEC verification code
Document version: 2.0
Posting date: 21 September 2022
Program impacted: BIND
- 9.8.4 -> 9.16.32
BIND Supported Preview Edition
- 9.9.4-S1 -> 9.11.37-S1
- 9.16.8-S1 -> 9.16.32-S1
The DNSSEC verification code for the ECDSA algorithm leaks memory when there is a signature length mismatch.
By spoofing the target resolver with responses that have a malformed ECDSA signature, an attacker can trigger a small memory leak. It is possible to gradually erode available memory to the point where named crashes for lack of resources.
CVSS Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1.
Disable the following algorithms in your configuration using the
disable-algorithms option: ECDSAP256SHA256, ECDSAP384SHA384. Note that this causes zones signed with these algorithms to be treated as insecure.
This flaw was discovered in internal testing. We are not aware of any active exploits.
Upgrade to the patched release most closely related to your current version of BIND:
BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.
Document revision history:
1.0 Early Notification, 14 September 2022
1.1 Minor punctuation corrections, 19 September 2022
2.0 Public disclosure, 21 September 2022
See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory should be mailed to email@example.com. To report a new issue, please encrypt your message using firstname.lastname@example.org's PGP key, which can be found here: https://www.isc.org/pgpkey/. If you are unable to use encrypted email you may also report new issues at: https://www.isc.org/reportbug/.
ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/.
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861.
The Knowledgebase article https://kb.isc.org/docs/cve-2022-38177 is the complete and official security advisory document.
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