PT-2022-5307 · Openssl+8 · Openssl+8
Viktor Dukhovni
·
Published
2022-10-28
·
Updated
2025-10-14
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CVE-2022-3786
CVSS v2.0
7.6
High
| Vector | AV:N/AC:H/Au:N/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
OpenSSL versions 3.0.0 through 3.0.6
Description
A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. 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.Recommendations
Update to OpenSSL version 3.0.7 to resolve the issue.
As a temporary workaround, consider restricting access to the vulnerable function
ossl a2ulabel() until a patch is available.
Avoid using the . character in email addresses in certificates to minimize the risk of exploitation.Exploit
Fix
DoS
RCE
Buffer Overflow
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Related Identifiers
Affected Products
Almalinux
Fortios
Ibm Aix
Linuxmint
Openssl
Red Hat
Rocky Linux
Suse
Ubuntu