USN-3840-1: OpenSSL vulnerabilities

Releases

• Ubuntu 18.10
• Ubuntu 18.04 ESM
• 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

Samuel Weiser discovered that OpenSSL incorrectly handled DSA signing. An
attacker could possibly use this issue to perform a timing side-channel
attack and recover private DSA keys. (CVE-2018-0734)

Samuel Weiser discovered that OpenSSL incorrectly handled ECDSA signing. An
attacker could possibly use this issue to perform a timing side-channel
attack and recover private ECDSA keys. This issue only affected Ubuntu
18.04 LTS and Ubuntu 18.10. (CVE-2018-0735)

Billy Bob Brumley, Cesar Pereida Garcia, Sohaib ul Hassan, Nicola Tuveri,
and Alejandro Cabrera Aldaya discovered that Simultaneous Multithreading
(SMT) architectures are vulnerable to side-channel leakage. This issue is
known as "PortSmash". An attacker could possibly use this issue to perform
a timing side-channel attack and recover private keys. (CVE-2018-5407)

Update instructions

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

Ubuntu 18.10

• libssl1.0.0 - 1.0.2n-1ubuntu6.1
• libssl1.1 - 1.1.1-1ubuntu2.1

Ubuntu 18.04

• libssl1.0.0 - 1.0.2n-1ubuntu5.2
• libssl1.1 - 1.1.0g-2ubuntu4.3

Ubuntu 16.04

• libssl1.0.0 - 1.0.2g-1ubuntu4.14

Ubuntu 14.04

• libssl1.0.0 - 1.0.1f-1ubuntu2.27

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

References

• CVE-2018-0734
• CVE-2018-0735
• CVE-2018-5407