title: World writable root owned lock file created in user controllable location
description: Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.
problem types: CWE-379 Creation of Temporary File in Directory with Incorrect Permissions
affected:
{
product: Apport
vendor: Canonical
versions:
lessThan: 2.20.1-0ubuntu2.23, status: affected, version: 2.20.1, versionType: custom
lessThan: 2.20.9-0ubuntu7.14, status: affected, version: 2.20.9, versionType: custom
changes: [at: 2.20.11-0ubuntu22, status: unaffected], lessThan: 2.20.11-0ubuntu8.8, status: affected, version: 2.20.11, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: HIGH
privilegesRequired: LOW
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
version: 3.1
]