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Ubuntu Security Notice 1477-1 - Georgi Guninski discovered that APT did not properly validate imported keyrings via apt-key net-update. USN-1475-1 added additional verification for imported keyrings, but it was insufficient. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could potentially be used to install altered packages. This update corrects the issue by disabling the net-update option completely. A future update will re-enable the option with corrected verification.
Ubuntu Security Notice USN-1475-1: Ubuntu Security Notice 1475-1 - Georgi Guninski discovered that APT relied on GnuPG argument order and did not check GPG subkeys when validating imported...
Ubuntu Security Notice USN-1628-1: Ubuntu Security Notice 1628-1 - Juliano Rizzo and Thai Duong discovered a flaw in the Transport Layer Security (TLS) protocol when it is used with data...
Ubuntu Security Notice USN-1666-1: Ubuntu Security Notice 1666-1 - It was discovered that Aptdaemon incorrectly validated PPA GPG keys when importing from a keyserver. If a remote attacker...
Ubuntu Security Notice USN-1634-1: Ubuntu Security Notice 1634-1 - Dwayne Litzenberger discovered that Python Keyring's CryptedFileKeyring file format used weak cryptography. A local attacker...
Ubuntu Security Notice USN-1683-1: Ubuntu Security Notice 1683-1 - A flaw was discovered in the Linux kernel's handling of script execution when module loading is enabled. A local attacker...