UnrealIRCd 4.0.13 and earlier Privilege Escalation via PID File Modification

CVE-2017-13649 · LOW Severity

AV:L/AC:L/AU:N/C:N/I:N/A:P

UnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for PID file modification before a root script executes a "kill `cat /pathname`" command. NOTE: the vendor indicates that there is no common or recommended scenario in which a root script would execute this kill command.

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