CVE-2019-15790 Information

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Reference

https://bugs.launchpad.net/apport/+bug/1854237 https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1839795 https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1850929 https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1851806 https://usn.ubuntu.com/4171-1/ https://usn.ubuntu.com/4171-2/ https://usn.ubuntu.com/4171-3/ https://usn.ubuntu.com/4171-4/ https://usn.ubuntu.com/4171-5/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

3.3