Florian Weimer discovered that shadow was not properly copying and removing user directory trees, which could lead to a race condition. A local attacker could possibly use this issue to setup a symlink attack and alter or remove directories without authorization.
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{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "binaries": [ { "binary_version": "1:4.2-3.1ubuntu5.5+esm2", "binary_name": "login" }, { "binary_version": "1:4.2-3.1ubuntu5.5+esm2", "binary_name": "login-dbgsym" }, { "binary_version": "1:4.2-3.1ubuntu5.5+esm2", "binary_name": "passwd" }, { "binary_version": "1:4.2-3.1ubuntu5.5+esm2", "binary_name": "passwd-dbgsym" }, { "binary_version": "1:4.2-3.1ubuntu5.5+esm2", "binary_name": "uidmap" }, { "binary_version": "1:4.2-3.1ubuntu5.5+esm2", "binary_name": "uidmap-dbgsym" } ] }
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