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).
CVE-2021-23841
CVSS Score: 5.9 (MEDIUM)
EPSS Score: 0.42%
Risk Score: 4.13 (MEDIUM)
Risk Score dựa trên điểm CVSS và EPSS. Điểm này chỉ mang tính chất tham khảo và không được công nhận quốc tế.


Mitre ATT&CK Technical v15.1
T1153 – Source
T1053.002 – At
Liên kết tham khảo
https://www.openssl.org/news/secadv/20210216.txt
https://www.debian.org/security/2021/dsa-4855
https://security.netapp.com/advisory/ntap-20210219-0009/
https://www.tenable.com/security/tns-2021-03
https://security.gentoo.org/glsa/202103-03
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
http://seclists.org/fulldisclosure/2021/May/68
http://seclists.org/fulldisclosure/2021/May/67
http://seclists.org/fulldisclosure/2021/May/70
https://www.oracle.com/security-alerts/cpuApr2021.html
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
https://www.oracle.com//security-alerts/cpujul2021.html
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
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
https://security.netapp.com/advisory/ntap-20240621-0006/
Vendor - Produce - Version
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