Buffer Overflow Affecting cryptography package, versions [35.0.0,38.0.3)
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Test your applications- Snyk ID SNYK-PYTHON-CRYPTOGRAPHY-3112177
- published 1 Nov 2022
- disclosed 1 Nov 2022
- credit Viktor Dukhovni
Introduced: 1 Nov 2022
CVE-2022-3786 Open this link in a new tabHow to fix?
Upgrade cryptography to version 38.0.3 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Overflow. A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed the malicious certificate or for the application to continue certificate verification despite failure to construct a path to a trusted issuer.
An attacker can craft a malicious email address to overflow an arbitrary number of bytes containing the . character (decimal 46) on the stack. This buffer overflow could result in a crash (causing a denial of service).
A full break down of this vulnerability can be found in our technical deep dive.
NOTE: The Node.js project has announced that 18.x and 19.x releases are affected, and fixed versions are expected on or soon after November 3. This advisory will be updated accordingly when they are released.
Changelog
November 1, 2022 - Advisory published.
November 2, 2022 - Node.js listed as affected, in advance of fix.
November 5, 2022 - Node.js fixed versions added.