An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leave_suid call. leave_suid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.
CVSS Details
- CVSS 3.1 Base Score: 4.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | No solution exists | May 15, 2025 | Apr 15, 2020 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Apr 15, 2020 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Apr 15, 2020 |
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