OpenSSL 3.0.7 has been released to address two critical security issues in the OpenSSL 3.0.x series. OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.
OpenSSL Security Advisory [01 November 2022]
X.509 Email Address 4-byte Buffer Overflow (CVE-2022-3602)
Severity: High
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 four attacker-controlled bytes on the stack. This buffer overflow could result in a crash (causing a denial of service) or potentially remote code execution.
Many platforms implement stack overflow protections which would mitigate against the risk of remote code execution. The risk may be further mitigated based on stack layout for any given platform/compiler.
Pre-announcements of CVE-2022-3602 described this issue as CRITICAL. Further analysis based on some of the mitigating factors described above have led this to be downgraded to HIGH. Users are still encouraged to upgrade to a new version as soon as possible.
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.
OpenSSL versions 3.0.0 to 3.0.6 are vulnerable to this issue.
OpenSSL 3.0 users should upgrade to OpenSSL 3.0.7.
OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.
This issue was reported to OpenSSL on 17th October 2022 by Polar Bear. The fixes were developed by Dr Paul Dale.
We are not aware of any working exploit that could lead to code execution, and we have no evidence of this issue being exploited as of the time of release of this advisory (November 1st 2022).
X.509 Email Address Variable Length Buffer Overflow (CVE-2022-3786)
Severity: High
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.
OpenSSL versions 3.0.0 to 3.0.6 are vulnerable to this issue.
OpenSSL 3.0 users should upgrade to OpenSSL 3.0.7.
OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.
This issue was discovered on 18th October 2022 by Viktor Dukhovni while researching CVE-2022-3602. The fixes were developed by Dr Paul Dale.
We have no evidence of this issue being exploited as of the time of release of this advisory (November 1st 2022).
References
URL for this Security Advisory:
https://www.openssl.org/news/secadv/20221101.txt
Note: the online version of the advisory may be updated with additional details over time.
For details of OpenSSL severity classifications please see: https://www.openssl.org/policies/secpolicy.html
