Matthias Gerstner discovered that there was a race condition in the mkhomedir tool shipped with the oddjob package. An authenticated attacker could use this to setup a symlink attack and change permissions on files on the host filesystem.
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "0.34.3-2ubuntu0.1~esm1", "binary_name": "oddjob" }, { "binary_version": "0.34.3-2ubuntu0.1~esm1", "binary_name": "oddjob-dbgsym" }, { "binary_version": "0.34.3-2ubuntu0.1~esm1", "binary_name": "oddjob-mkhomedir" }, { "binary_version": "0.34.3-2ubuntu0.1~esm1", "binary_name": "oddjob-mkhomedir-dbgsym" } ] }
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "0.34.3-4ubuntu0.1~esm1", "binary_name": "oddjob" }, { "binary_version": "0.34.3-4ubuntu0.1~esm1", "binary_name": "oddjob-dbgsym" }, { "binary_version": "0.34.3-4ubuntu0.1~esm1", "binary_name": "oddjob-mkhomedir" }, { "binary_version": "0.34.3-4ubuntu0.1~esm1", "binary_name": "oddjob-mkhomedir-dbgsym" } ] }
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "0.34.4-1ubuntu0.1~esm1", "binary_name": "oddjob" }, { "binary_version": "0.34.4-1ubuntu0.1~esm1", "binary_name": "oddjob-dbgsym" }, { "binary_version": "0.34.4-1ubuntu0.1~esm1", "binary_name": "oddjob-mkhomedir" }, { "binary_version": "0.34.4-1ubuntu0.1~esm1", "binary_name": "oddjob-mkhomedir-dbgsym" } ] }