It was discovered that libXdmcp was generating weak session keys. A local attacker could possibly use this issue to perform a brute force attack and obtain another user's key.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp-dev" }, { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp-dev-dbgsym" }, { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp6" }, { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp6-dbg" }, { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp6-dbgsym" }, { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp6-udeb" }, { "binary_version": "1:1.1.1-1ubuntu0.1~esm1", "binary_name": "libxdmcp6-udeb-dbgsym" } ] }
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp-dev" }, { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp-dev-dbgsym" }, { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp6" }, { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp6-dbg" }, { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp6-dbgsym" }, { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp6-udeb" }, { "binary_version": "1:1.1.2-1.1ubuntu0.1~esm1", "binary_name": "libxdmcp6-udeb-dbgsym" } ] }