Vulnerability Description
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openssl | Openssl | >= 1.0.2, < 1.0.2y |
| Debian | Debian Linux | 10.0 |
| Tenable | Nessus Network Monitor | 5.11.0 |
| Tenable | Tenable.Sc | >= 5.13.0, <= 5.17.0 |
| Apple | Safari | < 14.1.1 |
| Apple | Ipados | < 14.6 |
| Apple | Iphone Os | < 14.6 |
| Apple | Macos | >= 11.1, < 11.4 |
| Netapp | Oncommand Insight | - |
| Netapp | Oncommand Workflow Automation | - |
| Netapp | Snapcenter | - |
| Oracle | Business Intelligence | 5.5.0.0.0 |
| Oracle | Communications Cloud Native Core Policy | 1.15.0 |
| Oracle | Enterprise Manager For Storage Management | 13.4.0.0 |
| Oracle | Enterprise Manager Ops Center | 12.4.0.0 |
| Oracle | Essbase | 21.2 |
| Oracle | Graalvm | 19.3.5 |
| Oracle | Jd Edwards World Security | a9.4 |
| Oracle | Mysql Enterprise Monitor | < 8.0.23 |
| Oracle | Mysql Server | < 5.7.33 |
Related Weaknesses (CWE)
References
- http://seclists.org/fulldisclosure/2021/May/67Mailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2021/May/68Mailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2021/May/70Mailing ListThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfPatchThird Party Advisory
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c6
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f20
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846Third Party Advisory
- https://security.gentoo.org/glsa/202103-03Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210219-0009/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210513-0002/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://support.apple.com/kb/HT212528Third Party Advisory
- https://support.apple.com/kb/HT212529Third Party Advisory
- https://support.apple.com/kb/HT212534Third Party Advisory
- https://www.debian.org/security/2021/dsa-4855Third Party Advisory
FAQ
What is CVE-2021-23841?
CVE-2021-23841 is a vulnerability with a CVSS score of 5.9 (MEDIUM). The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails t...
How severe is CVE-2021-23841?
CVE-2021-23841 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-23841?
Check the references section above for vendor advisories and patch information. Affected products include: Openssl Openssl, Debian Debian Linux, Tenable Nessus Network Monitor, Tenable Tenable.Sc, Apple Safari.