| Name | CVE-2019-3843 |
| Description | It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the transient service UID/GID even after the service is terminated. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the UID/GID will be recycled. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 928102 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| systemd (PTS) | jessie, jessie (lts) | 215-17+deb8u15 | fixed |
| stretch (security) | 232-25+deb9u14 | vulnerable | |
| stretch (lts), stretch | 232-25+deb9u17 | vulnerable | |
| buster, buster (lts) | 241-7~deb10u11 | vulnerable | |
| buster (security) | 241-7~deb10u10 | vulnerable | |
| bullseye | 247.3-7+deb11u5 | fixed | |
| bullseye (security) | 247.3-7+deb11u6 | fixed | |
| bookworm | 252.31-1~deb12u1 | fixed | |
| trixie | 257-2 | fixed | |
| sid | 257.1-4 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| systemd | source | experimental | 242-1 | |||
| systemd | source | wheezy | (not affected) | |||
| systemd | source | jessie | (not affected) | |||
| systemd | source | (unstable) | 242-4 | 928102 |
[buster] - systemd <ignored> (Minor issue; exploit vector needs control both of the service and a helper outside)
[stretch] - systemd <ignored> (Minor issue; exploit vector needs control both of the service and a helper outside)
[jessie] - systemd <not-affected> (Vulnerable code introduced later)
https://github.com/systemd/systemd/commit/3c27973b13724ede05a06a5d346a569794cda433
https://github.com/systemd/systemd/commit/f69567cbe26d09eac9d387c0be0fc32c65a83ada
https://github.com/systemd/systemd/commit/9d880b70ba5c6ca83c82952f4c90e86e56c7b70c
https://github.com/systemd/systemd/commit/7445db6eb70e8d5989f481d0c5a08ace7047ae5b
https://github.com/systemd/systemd/commit/62aa29247c3d74bcec0607c347f2be23cd90675d
https://github.com/systemd/systemd/commit/bf65b7e0c9fc215897b676ab9a7c9d1c688143ba
https://bugs.chromium.org/p/project-zero/issues/detail?id=1771
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1814596
https://github.com/systemd/systemd-stable/pull/54 (backport for v241-stable)
[wheezy] - systemd <not-affected> (Vulnerable code introduced later)