USN-6168-1 fixed a vulnerability in libx11. This update provides the corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, and Ubuntu 18.04 ESM.
Original advisory details:
Gregory James Duck discovered that libx11 incorrectly handled certain Request, Event, or Error IDs. If a user were tricked into connecting to a malicious X Server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_name": "libx11-6", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-6-dbg", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-6-dbgsym", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-6-udeb", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-6-udeb-dbgsym", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-data", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-dev", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-dev-dbgsym", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-doc", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-xcb-dev", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-xcb-dev-dbgsym", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-xcb1", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-xcb1-dbg", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" }, { "binary_name": "libx11-xcb1-dbgsym", "binary_version": "2:1.6.2-1ubuntu2.1+esm3" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_name": "libx11-6", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-6-dbg", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-6-dbgsym", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-6-udeb", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-6-udeb-dbgsym", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-data", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-dev", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-dev-dbgsym", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-doc", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-xcb-dev", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-xcb-dev-dbgsym", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-xcb1", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-xcb1-dbg", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" }, { "binary_name": "libx11-xcb1-dbgsym", "binary_version": "2:1.6.3-1ubuntu2.2+esm2" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_name": "libx11-6", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-6-dbgsym", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-6-udeb", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-data", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-dev", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-doc", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-xcb-dev", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-xcb1", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" }, { "binary_name": "libx11-xcb1-dbgsym", "binary_version": "2:1.6.4-3ubuntu0.4+esm1" } ] }