CVE-2019-15790: 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Canonical Apport

2.14.1 to < 2.14.1-0ubuntu3.29+esm3affected
2.20.1 to < 2.20.1-0ubuntu2.22affected
2.20.9 to < 2.20.9-0ubuntu7.12affected
2.20.11 to < 2.20.11-0ubuntu8.6affected

CVE-2019-15790

Apport reads PID files with elevated privileges

Description

Affected products

Canonical Apport

References