CVE-2018-12029
High
Description
A race condition in the nginx module in Phusion Passenger 3.x through 5.x before 5.3.2 allows local escalation of privileges when a non-standard passenger_instance_registry_dir with insufficiently strict permissions is configured. Replacing a file with a symlink after the file was created, but before it was chowned, leads to the target of the link being chowned via the path. Targeting sensitive files such as root's crontab file allows privilege escalation.
SeverityHigh
CVSS7.0
Exploit probability—
Product
Phusion Passenger
PublishedJun 17, 2018
First seenJun 17, 2018
How to fix
Update
- phusion passenger5.3.2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| phusion passenger | 3.0.0 ≤ v < 5.3.2 | 5.3.2 |
| debian debian_linux | 8.0 | — |
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