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CVE-2019-12522

MEDIUMCVSS 4.5/10EPSS 0.34%

Last modified

CVE-2019-12522 is a medium-severity vulnerability rated 4.5/10 on the CVSS scale. 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. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
4.5/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS Probability
0.34%

26.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Squid-CacheSquid<= 4.7

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-12522?
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.
How severe is CVE-2019-12522?
CVE-2019-12522 has a CVSS score of 4.5/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.
How do I fix CVE-2019-12522?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-12522?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST