Advisory Published

USN-4738-1: OpenSSL vulnerabilities

First published: Thu Feb 18 2021(Updated: )

Paul Kehrer discovered that OpenSSL incorrectly handled certain input lengths in EVP functions. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23840) Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer fields. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23841)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libssl1.1<1.1.1f-1ubuntu4.2
1.1.1f-1ubuntu4.2
Ubuntu Ubuntu=20.10
All of
ubuntu/libssl1.1<1.1.1f-1ubuntu2.2
1.1.1f-1ubuntu2.2
Ubuntu Ubuntu=20.04
All of
ubuntu/libssl1.0.0<1.0.2n-1ubuntu5.6
1.0.2n-1ubuntu5.6
Ubuntu Ubuntu=18.04
All of
ubuntu/libssl1.1<1.1.1-1ubuntu2.1~18.04.8
1.1.1-1ubuntu2.1~18.04.8
Ubuntu Ubuntu=18.04
All of
ubuntu/libssl1.0.0<1.0.2g-1ubuntu4.19
1.0.2g-1ubuntu4.19
Ubuntu Ubuntu=16.04

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