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CVE-2019-15790

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4171-6
Posted Nov 12, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-6 - USN-4171-1 fixed vulnerabilities in Apport. The update caused a regression when handling configuration files. This update fixes the problem, and also introduces further hardening measures. Kevin Backhouse discovered Apport would read its user-controlled settings file as the root user. This could be used by a local attacker to possibly crash Apport or have other unspecified consequences. Sander Bos discovered a race-condition in Apport during core dump creation. This could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Sander Bos discovered Apport mishandled crash dumps originating from containers. This could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Sander Bos discovered Apport mishandled lock-file creation. This could be used by a local attacker to cause a denial of service against Apport. Kevin Backhouse discovered Apport read various process-specific files with elevated privileges during crash dump generation. This could could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Various other issues were also addressed.

tags | advisory, denial of service, local, root, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | bf6d214866122a7e4c574dda44e1251b
Ubuntu Security Notice USN-4171-5
Posted Mar 18, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-5 - USN-4171-1 fixed vulnerabilities in Apport. This caused a regression in autopkgtest and python2 compatibility. This update fixes the problem. Kevin Backhouse discovered Apport would read its user-controlled settings file as the root user. This could be used by a local attacker to possibly crash Apport or have other unspecified consequences. Sander Bos discovered a race-condition in Apport during core dump creation. This could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Sander Bos discovered Apport mishandled crash dumps originating from containers. This could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Sander Bos discovered Apport mishandled lock-file creation. This could be used by a local attacker to cause a denial of service against Apport. Kevin Backhouse discovered Apport read various process-specific files with elevated privileges during crash dump generation. This could could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Various other issues were also addressed.

tags | advisory, denial of service, local, root, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | b7c1da16b8ea42319c7c7dcf19894e3d
Ubuntu Security Notice USN-4171-4
Posted Nov 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-4 - USN-4171-2 fixed a vulnerability in Apport. The update caused a regression in the Python Apport library. This update fixes the problem for Ubuntu 14.04 ESM. Kevin Backhouse discovered Apport would read its user-controlled settings file as the root user. This could be used by a local attacker to possibly crash Apport or have other unspecified consequences. Various other issues were also addressed.

tags | advisory, local, root, python
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | 1f07f6de70fdeb3fd7690f336bc3cfb3
Ubuntu Security Notice USN-4171-3
Posted Nov 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-3 - USN-4171-1 fixed vulnerabilities in Apport. The update caused a regression in the Python Apport library. This update fixes the problem. Kevin Backhouse discovered Apport would read its user-controlled settings file as the root user. This could be used by a local attacker to possibly crash Apport or have other unspecified consequences. Various other issues were also addressed.

tags | advisory, local, root, vulnerability, python
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | e549544faf81ebbea551c9f8be0a7a87
Ubuntu Security Notice USN-4171-2
Posted Nov 4, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-2 - USN-4171-1 fixed several vulnerabilities in apport. This update provides the corresponding update for Ubuntu 14.04 ESM. Kevin Backhouse discovered Apport would read its user-controlled settings file as the root user. This could be used by a local attacker to possibly crash Apport or have other unspecified consequences. Various other issues were also addressed.

tags | advisory, local, root, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | 9001ec2123f134738345960ba8a47141
Ubuntu Security Notice USN-4171-1
Posted Oct 30, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-1 - Kevin Backhouse discovered Apport would read its user-controlled settings file as the root user. This could be used by a local attacker to possibly crash Apport or have other unspecified consequences. Sander Bos discovered a race-condition in Apport during core dump creation. This could be used by a local attacker to generate a crash report for a privileged process that is readable by an unprivileged user. Various other issues were also addressed.

tags | advisory, local, root
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | 4435b79c84276bd5e52920e950cd2986
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