title: Apport reads PID files with elevated privileges
description: Apport reads and writes information on a crashed process to /proc/pid with elevated privileges. Apport then determines which user the crashed process belongs to by reading /proc/pid through get_pid_info() in data/apport. An unprivileged user could exploit this to read information about a privileged running process by exploiting PID recycling. This information could then be used to obtain ASLR offsets for a process with an existing memory corruption vulnerability. The initial fix introduced regressions in the Python Apport library due to a missing argument in Report.add_proc_environ in apport/report.py. It also caused an autopkgtest failure when reading /proc/pid and with Python 2 compatibility by reading /proc maps. The initial and subsequent regression fixes are in 2.20.11-0ubuntu16, 2.20.11-0ubuntu8.6, 2.20.9-0ubuntu7.12, 2.20.1-0ubuntu2.22 and 2.14.1-0ubuntu3.29+esm3.
problem types: CWE-250 Execution with Unnecessary Privileges
affected:
{
vendor: Canonical
product: Apport
versions:
version: 2.14.1, status: affected, lessThan: 2.14.1-0ubuntu3.29+esm3, versionType: custom
version: 2.20.1, status: affected, lessThan: 2.20.1-0ubuntu2.22, versionType: custom
version: 2.20.9, status: affected, lessThan: 2.20.9-0ubuntu7.12, versionType: custom
version: 2.20.11, status: affected, lessThan: 2.20.11-0ubuntu8.6, versionType: custom, changes: [at: 2.20.11-0ubuntu16, status: unaffected]
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
attackVector: LOCAL
attackComplexity: HIGH
privilegesRequired: LOW
userInteraction: NONE
scope: CHANGED
confidentialityImpact: LOW
integrityImpact: NONE
availabilityImpact: NONE
baseScore: 2.8
baseSeverity: LOW
]