CVE-2019-12522

low-risk
Published 2020-04-15

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.

Do I need to act?

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0.18% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.5/10 Medium
LOCAL / HIGH complexity

Affected Products (1)

Affected Vendors

Squid-Cache

References (4)

Third Party Advisory https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12522.t...
Third Party Advisory https://security.netapp.com/advisory/ntap-20210205-0006/
Third Party Advisory https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12522.t...
Third Party Advisory https://security.netapp.com/advisory/ntap-20210205-0006/
18
/ 100
low-risk
Severity 12/34 · Low
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal