CVE-2021-23841

 

Published at: - 16-02-2021 06:15

Last modified: - 07-10-2022 06:34

Total changes: - 23

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).

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://www.openssl.org/news/secadv/20210216.txt
• https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
• https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
• DSA-4855-Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210219-0009/
• https://www.tenable.com/security/tns-2021-03
• GLSA-202103-03-Third Party Advisory
• https://www.tenable.com/security/tns-2021-09
• https://security.netapp.com/advisory/ntap-20210513-0002/
• https://support.apple.com/kb/HT212529
• https://support.apple.com/kb/HT212528
• https://support.apple.com/kb/HT212534
• 20210526 APPLE-SA-2021-05-25-5 Safari 14.1.1-Mailing List, Third Party Advisory
• 20210526 APPLE-SA-2021-05-25-1 iOS 14.6 and iPadOS 14.6-Mailing List, Third Party Advisory
• 20210526 APPLE-SA-2021-05-25-2 macOS Big Sur 11.4-Mailing List, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.html
• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
• N/A-Patch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2021.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf

 

Keywords

NVD

 

CVE-2021-23841

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures