CVE-2022-4203
X.509 Name Constraints Read Buffer Overflow
Description
A read 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. The read buffer overrun might result in a crash which could lead to a denial of service attack. In theory it could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext) although we are not aware of any working exploit leading to memory contents disclosure as of the time of release of this advisory. 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-2022-4203
To remediate CVE-2022-4203, upgrade the affected package to a fixed version below.
- —upgrade to 3.0.8-r0 or later
- —upgrade to 3.0.8-r0 or later
- —upgrade to 300.0.12 or later
- —upgrade to 300.0.12 or later
- —upgrade to 3.0.8-1 or later
Is CVE-2022-4203 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 3.0.8-r0
- from 0, < 3.0.8-r0
- >= 300.0.0, < 300.0.12
- >= 300.0.0, < 300.0.12
- from 0, < 3.0.8-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |