CVE-2020-1712: Use After Free
First published: Thu Jan 23 2020(Updated: )
A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted dbus messages.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/systemd | <245 | 245 |
| Systemd Project Systemd | <=244 | |
| Redhat Ceph Storage | =4.0 | |
| Redhat Discovery | ||
| Redhat Migration Toolkit | =1.0 | |
| Redhat Openshift Container Platform | =4.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| ubuntu/systemd | <237-3ubuntu10.38 | 237-3ubuntu10.38 |
| ubuntu/systemd | <242-7ubuntu3.6 | 242-7ubuntu3.6 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <244.1-0ubuntu3 | 244.1-0ubuntu3 |
| ubuntu/systemd | <229-4ubuntu21.27 | 229-4ubuntu21.27 |
| debian/systemd | 241-7~deb10u8 241-7~deb10u10 247.3-7+deb11u4 252.22-1~deb12u1 255.5-1 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1712
- https://github.com/systemd/systemd/commit/1068447e6954dc6ce52f099ed174c442cb89ed54
- https://github.com/systemd/systemd/commit/637486261528e8aa3da9f26a4487dc254f4b7abb
- https://github.com/systemd/systemd/commit/bc130b6858327b382b07b3985cf48e2aa9016b2d
- https://github.com/systemd/systemd/commit/ea0d0ede03c6f18dbc5036c5e9cccf97e415ccc2
- https://lists.debian.org/debian-lts-announce/2022/06/msg00025.html
- https://www.openwall.com/lists/oss-security/2020/02/05/1
- https://launchpad.net/bugs/cve/CVE-2020-1712
- https://github.com/systemd/systemd/commit/70244d1d25eb80b57e160ea004d0e6bf793d4caf
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1798414
- https://access.redhat.com/errata/RHSA-2020:0564
- https://access.redhat.com/security/cve/cve-2020-1712
- https://access.redhat.com/errata/RHSA-2020:0575
- https://bugzilla.redhat.com/show_bug.cgi?id=1794578
- https://github.com/systemd/systemd/commit/773b1a7916bfce3aa2a21ecf534d475032e8528e
- https://github.com/systemd/systemd/commit/95f82ae9d774f3508ce89dcbdd0714ef7385df59
- https://github.com/systemd/systemd/commit/7f56982289275ce84e20f0554475864953e6aaab
- https://github.com/systemd/systemd/commit/f4425c72c7395ec93ae00052916a66e2f60f200b
- https://github.com/systemd/systemd/commit/5c1163273569809742c164260cfd9f096520cb82
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1971
- https://security-tracker.debian.org/tracker/CVE-2020-1712
- https://ubuntu.com/security/notices/USN-4269-1
- https://www.cve.org/CVERecord?id=CVE-2020-1712
- https://nvd.nist.gov/vuln/detail/CVE-2020-1712
- https://github.com/poettering/systemd/commits/polkit-ref-count
- https://ubuntu.com/security/CVE-2020-1712
Frequently Asked Questions
What is CVE-2020-1712?
CVE-2020-1712 is a heap use-after-free vulnerability found in systemd before version v245-rc1.
How does CVE-2020-1712 impact systemd services?
CVE-2020-1712 allows a local unprivileged attacker to crash systemd services or potentially execute code and elevate their privileges.
Which software versions are affected by CVE-2020-1712?
CVE-2020-1712 affects systemd versions 241-7~deb10u8, 241-7~deb10u10, 247.3-7+deb11u4, 252.17-1~deb12u1, and 254.5-1 on Debian, and versions 244.1-0ubuntu3 on Ubuntu.
How can I fix CVE-2020-1712?
To fix CVE-2020-1712, update the affected systemd package to version 241-7~deb10u10 or install the latest version available for your Linux distribution.
Where can I find more information about CVE-2020-1712?
You can find more information about CVE-2020-1712 in the following references: [Bugzilla Red Hat](https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1712), [GitHub Commit 1](https://github.com/systemd/systemd/commit/1068447e6954dc6ce52f099ed174c442cb89ed54), [GitHub Commit 2](https://github.com/systemd/systemd/commit/637486261528e8aa3da9f26a4487dc254f4b7abb).
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