Package Instance

Utils.cpp Temporary Directory Creation Symlink Local Privilege Escalation
This package contains a flaw as the program creates temporary directories insecurely. It is possible for a local attacker to use a symlink attack against the Utils.cpp file to allow the attacker to gain elevated privileges.

Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)
A race condition in the nginx module in Phusion Passenger 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.

Predictable tmp File Path Vulnerability
A known /tmp filename is used during passenger-install-nginx-module execution, which can allow local attackers to gain the privileges of the passenger user.

Header overwriting
It is possible in some cases, for clients to overwrite headers set by the server, resulting in a medium level security issue. Passenger 5 uses an SCGI-inspired format to pass headers to Ruby/Python applications, while Passenger 4 uses an SCGI-inspired format to pass headers to all applications. This implies a conversion to UPPER_CASE_WITH_UNDERSCORES whereby the difference between characters like '-' and '_' is lost. See "Affected use-cases" in provided link to establish wether one particular application is affected.

Instance Directory Creation Symlink Arbitrary File Overwrite
Passenger Gem for Ruby contains a flaw as the program creates the server instance directory insecurely. It is possible for a local attacker to use a symlink attack against the directory to cause the program to unexpectedly overwrite an arbitrary file.

Incorrect temporary file usage
The passenger ruby gem, when used in standalone mode, does not use temporary files securely. If a local attacker were able to create a temporary directory that passenger uses and supply a custom nginx configuration file they could start a nginx instance with their own configuration file.

Server Instance Directory Creation Local Symlink File Overwrite
This package contains a flaw as the program creates the server instance directory insecurely. It is possible for a local attacker to use a symlink attack against the directory to cause the program to unexpectedly overwrite an arbitrary file.

Incorrect Permission Assignment for Critical Resource
An issue was discovered in Phusion Passenger. 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.