CVE-2019-12522
Published: 15 April 2020
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.
Notes
| Author | Note |
|---|---|
| mdeslaur | as of 2023-12-05, there is no fix from upstream for this issue |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
squid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Deferred
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Deferred
|
|
| kinetic |
Ignored
(end of life, was deferred)
|
|
| lunar |
Ignored
(end of life, was deferred)
|
|
| mantic |
Deferred
|
|
| trusty |
Does not exist
|
|
| upstream |
Needed
|
|
| xenial |
Does not exist
|
|
|
squid3 Launchpad, Ubuntu, Debian |
bionic |
Deferred
|
| eoan |
Does not exist
|
|
| focal |
Does not exist
|
|
| groovy |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needed
|
|
| xenial |
Deferred
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4.5 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | Low |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L |