CVE-2022-3786
X.509 Email Address Variable Length Buffer Overflow
Description
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 a malicious certificate or for an application to continue certificate verification despite failure to construct a path to a trusted issuer. An attacker can craft a malicious email address in a certificate 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). In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects.
How to fix CVE-2022-3786
To remediate CVE-2022-3786, upgrade the affected package to a fixed version below.
- —upgrade to 18.12.1-r0 or later
- —upgrade to 3.0.7-r0 or later
- —upgrade to 3.0.7-r0 or later
Is CVE-2022-3786 being exploited?
Likely — EPSS is 92.5%, placing CVE-2022-3786 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (3)
- from 0, < 18.12.1-r0
- >= 3.0.0, < 3.0.7-r0
- from 0, < 3.0.7-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |