openssl vulnerabilities

31 January 2017

openssl vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 16.10
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software Description

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

Details

Guido Vranken discovered that OpenSSL used undefined behaviour when performing pointer arithmetic. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS as other releases were fixed in a previous security update. (CVE-2016-2177)

It was discovered that OpenSSL did not properly handle Montgomery multiplication, resulting in incorrect results leading to transient failures. This issue only applied to Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-7055)

It was discovered that OpenSSL did not properly use constant-time operations when performing ECDSA P-256 signing. A remote attacker could possibly use this issue to perform a timing attack and recover private ECDSA keys. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-7056)

Shi Lei discovered that OpenSSL incorrectly handled certain warning alerts. A remote attacker could possibly use this issue to cause OpenSSL to stop responding, resulting in a denial of service. (CVE-2016-8610)

Robert Święcki discovered that OpenSSL incorrectly handled certain truncated packets. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2017-3731)

It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. This issue only applied to Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2017-3732)

Update instructions

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

Ubuntu 16.10

libssl1.0.0 - 1.0.2g-1ubuntu9.1

Ubuntu 16.04 LTS

libssl1.0.0 - 1.0.2g-1ubuntu4.6

Ubuntu 14.04 LTS

libssl1.0.0 - 1.0.1f-1ubuntu2.22

Ubuntu 12.04 LTS

libssl1.0.0 - 1.0.1-4ubuntu5.39

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

• CVE-2016-2177
• CVE-2016-7055
• CVE-2016-7056
• CVE-2016-8610
• CVE-2017-3731
• CVE-2017-3732