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.
Published 2020-04-15 19:15:12
Updated 2021-03-10 17:27:49
Source MITRE
View at NVD,   CVE.org

Threat overview for CVE-2019-12522

Top countries where our scanners detected CVE-2019-12522
Top open port discovered on systems with this issue 3128
IPs affected by CVE-2019-12522 1,101,252
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2019-12522!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2019-12522

0.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-12522

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.4
MEDIUM AV:L/AC:M/Au:N/C:P/I:P/A:P
3.4
6.4
NIST
4.5
MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
1.0
3.4
NIST

CWE ids for CVE-2019-12522

  • The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-12522

Products affected by CVE-2019-12522

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