USN-4745-1: OpenSSL vulnerabilities

Releases

• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• openssl - Secure Socket Layer (SSL) cryptographic library and tools

Details

David Benjamin discovered that OpenSSL incorrectly handled comparing
certificates containing a EDIPartyName name type. A remote attacker could
possibly use this issue to cause OpenSSL to crash, resulting in a denial of
service. (CVE-2020-1971)

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)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04

• libssl1.0.0 - 1.0.1f-1ubuntu2.27+esm2

Ubuntu 12.04

• libssl1.0.0 - 1.0.1-4ubuntu5.45

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• CVE-2021-23841
• CVE-2020-1971

Related notices

• USN-4738-1: openssl, libssl1.0-dev, libcrypto1.1-udeb, libssl1.1, openssl1.0, libssl1.0.0, libssl1.1-udeb, libcrypto1.0.0-udeb, libssl-dev, libssl-doc, libssl1.0.0-udeb
• USN-4662-1: openssl, libssl1.0-dev, libcrypto1.1-udeb, libssl1.1, openssl1.0, libssl1.0.0, libssl1.1-udeb, libcrypto1.0.0-udeb, libssl-dev, libssl-doc, libssl1.0.0-udeb