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CVE-2021-23841

Published: 16 February 2021

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).

Priority

Medium

CVSS 3 base score: 5.9

Status

Package Release Status
edk2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(0~20180205.c0d9813c-2ubuntu0.3)
focal Not vulnerable
(0~20191122.bd85bf54-2ubuntu3.1)
groovy Not vulnerable
(2020.05-5ubuntu0.1)
precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(0~20160408.ffea0a2c-2ubuntu0.2)
nodejs
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(uses system openssl1.0)
focal Not vulnerable
(uses system openssl1.1)
groovy Not vulnerable
(uses system openssl1.1)
precise Does not exist

trusty Not vulnerable
(uses system openssl)
upstream Needs triage

xenial Not vulnerable
(uses system openssl)
openssl
Launchpad, Ubuntu, Debian
bionic
Released (1.1.1-1ubuntu2.1~18.04.8)
focal
Released (1.1.1f-1ubuntu2.2)
groovy
Released (1.1.1f-1ubuntu4.2)
precise
Released (1.0.1-4ubuntu5.45)
trusty
Released (1.0.1f-1ubuntu2.27+esm2)
upstream
Released (1.1.1j)
xenial
Released (1.0.2g-1ubuntu4.19)
openssl1.0
Launchpad, Ubuntu, Debian
bionic
Released (1.0.2n-1ubuntu5.6)
focal Does not exist

groovy Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (1.0.2y)
xenial Does not exist