USN-3692-1: OpenSSL vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 17.10
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• openssl - Secure Socket Layer (SSL) cryptographic library and tools
• openssl1.0 - Secure Socket Layer (SSL) cryptographic library and tools

Details

Keegan Ryan discovered that OpenSSL incorrectly handled ECDSA key
generation. An attacker could possibly use this issue to perform a
cache-timing attack and recover private ECDSA keys. (CVE-2018-0495)

Guido Vranken discovered that OpenSSL incorrectly handled very large prime
values during a key agreement. A remote attacker could possibly use this
issue to consume resources, leading to a denial of service. (CVE-2018-0732)

Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis
Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA key
generation. An attacker could possibly use this issue to perform a
cache-timing attack and recover private RSA keys. (CVE-2018-0737)

Update instructions

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

Ubuntu 18.04

• libssl1.0.0 - 1.0.2n-1ubuntu5.1
• libssl1.1 - 1.1.0g-2ubuntu4.1

Ubuntu 17.10

• libssl1.0.0 - 1.0.2g-1ubuntu13.6

Ubuntu 16.04

• libssl1.0.0 - 1.0.2g-1ubuntu4.13

Ubuntu 14.04

• libssl1.0.0 - 1.0.1f-1ubuntu2.26

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

References

• CVE-2018-0495
• CVE-2018-0732
• CVE-2018-0737

Related notices

• USN-3692-2: openssl, libssl1.0.0
• USN-3689-2: libgcrypt11
• USN-3689-1: libgcrypt20-doc, libgcrypt20-udeb, libgcrypt11-dev, libgcrypt20, libgcrypt11, libgcrypt-mingw-w64-dev, libgcrypt11-doc, libgcrypt11-udeb, libgcrypt20-dev
• USN-3850-1: libnss3-1d, libnss3-nssdb, nss, libnss3-dev, libnss3-tools, libnss3
• USN-3850-2: nss, libnss3
• USN-3628-1: libssl-doc, libssl1.0.0, libcrypto1.0.0-udeb, libssl1.0.0-udeb, libssl-dev, openssl
• USN-3628-2: openssl, libssl1.0.0