CVE-2021-23841

Name
CVE-2021-23841
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).
NVD Severity
medium
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Vendor Advisory https://www.openssl.org/news/secadv/20210216.txt
Vendor Advisory https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
Patch https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
vendor-advisory https://www.debian.org/security/2021/dsa-4855
Third Party Advisory https://security.netapp.com/advisory/ntap-20210219-0009/
Third Party Advisory https://www.tenable.com/security/tns-2021-03
vendor-advisory https://security.gentoo.org/glsa/202103-03
CONFIRM https://www.tenable.com/security/tns-2021-09
CONFIRM https://security.netapp.com/advisory/ntap-20210513-0002/
Third Party Advisory https://support.apple.com/kb/HT212529
Third Party Advisory https://support.apple.com/kb/HT212528
Third Party Advisory https://support.apple.com/kb/HT212534
mailing-list http://seclists.org/fulldisclosure/2021/May/68
mailing-list http://seclists.org/fulldisclosure/2021/May/67
mailing-list http://seclists.org/fulldisclosure/2021/May/70
MISC https://www.oracle.com/security-alerts/cpuApr2021.html
CONFIRM https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
N/A https://www.oracle.com//security-alerts/cpujul2021.html
MISC https://www.oracle.com/security-alerts/cpuoct2021.html
MISC https://www.oracle.com/security-alerts/cpuapr2022.html
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://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
https://security.netapp.com/advisory/ntap-20240621-0006/

Match rules

CPE URI Source package Min version Max version
openssl == Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i) == Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i)
openssl == Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x) == Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x)

Vulnerable and fixed packages

Source package Branch Version Maintainer Status