What’s Vulnerable › Vulnerabilities

CVE-2018-12615

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-21 · updated 2026-06-17
• Weakness: CWE-732

Description

An issue was discovered in switchGroup() in agent/ExecHelper/ExecHelperMain.cpp in Phusion Passenger before 5.3.2. The set of groups (gidset) is not set correctly, leaving it up to randomness (i.e., uninitialized memory) which supplementary groups are actually being set while lowering privileges.

Affected products

• Phusion Passenger: before 5.3.2 — fixed in 5.3.2

How to fix

Upgrade to a fixed version: Phusion Passenger 5.3.2. Check the vendor advisory for mitigations.

References

• https://github.com/phusion/passenger/commit/4e97fdb86d0a0141ec9a052c6e691fcd07bb45c8
• https://github.com/phusion/passenger/commit/4e97fdb86d0a0141ec9a052c6e691fcd07bb45c8

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