CVE-2022-2881: CVE-2022-2881: Buffer overread in statistics channel code

CVE: CVE-2022-2881

Document version: 2.0

Posting date: 21 September 2022

Program impacted: BIND

Versions affected:

BIND

• 9.18.0 -> 9.18.6
• 9.19.0 -> 9.19.4

BIND Supported Preview Edition

• None

Severity: Medium

Exploitable: Remotely

Description:

When an HTTP connection was reused to request statistics from the stats channel, the content length of successive responses could grow in size past the end of the allocated buffer.

Impact:

The underlying bug might cause read past end of the buffer and either read memory it should not read, or crash the process.

CVSS Score: 5.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/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:H/UI:N/S:U/C:L/I:N/A:H&version=3.1.

Workarounds:

Disable the statistics channel.

Active exploits:

This flaw was discovered in internal testing. We are not aware of any active exploits.

Solution:

Upgrade to the patched release most closely related to your current version of BIND:

• 9.18.7
• 9.19.5

The flaw does not affect any versions of BIND prior to 9.18, including BIND 9.16-S.

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

Related documents:

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 protected]. To report a new issue, please encrypt your message using [email protected]’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/.

Note:

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-2022-2881 is the complete and official security advisory document.

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