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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: CVE-2021-3560 is a critical **Authentication Bypass** in **polkit**. It allows unprivileged users to bypass authentication checks via DBus.โฆ
๐ก๏ธ **Root Cause**: **CWE-863** (Incorrect Authorization). The flaw occurs when a process disconnects from **dbus-daemon** before `polkit_system_bus_name_get_creds_sync` completes.โฆ
๐ **Attacker Actions**: An unprivileged user can call privileged methods (`CreateUser`, `SetPassword`) via DBus. ๐ ๏ธ **Impact**: They can create a new **privileged user**, set a password, and log in.โฆ
๐ **Threshold**: **LOW**. ๐ช **Auth**: **None** required. Any local unprivileged user can exploit this. โ๏ธ **Config**: Requires the vulnerable polkit version and accountsservice.โฆ
๐ฉน **Official Fix**: **YES**. The vulnerability was disclosed in June 2021. ๐ฆ **Patch**: Vendors released updates for polkit. Users must update polkit to the patched version.โฆ
๐จ **Urgency**: **CRITICAL**. ๐ด **Priority**: **P0**. This is a **Local Privilege Escalation (LPE)** vulnerability with **no authentication** required. It grants **root** access instantly.โฆ