Packages
- 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....
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
After a standard system update you need to reboot your computer to make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 16.10 yakkety | libssl1.0.0 – 1.0.2g-1ubuntu9.1 | ||
| 16.04 xenial | libssl1.0.0 – 1.0.2g-1ubuntu4.6 | ||
| 14.04 trusty | libssl1.0.0 – 1.0.1f-1ubuntu2.22 | ||
| 12.04 precise | libssl1.0.0 – 1.0.1-4ubuntu5.39 | ||
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