Description
systemd 250 and 251 allows local users to achieve a systemd-coredump deadlock by triggering a crash that has a long backtrace. This occurs in parse_elf_object in shared/elf-util.c. The exploitation methodology is to crash a binary calling the same function recursively, and put it in a deeply nested directory to make its backtrace large enough to cause the deadlock. This must be done 16 times when MaxConnections=16 is set for the systemd/units/systemd-coredump.socket file.
CVSS breakdown
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- fedoraproject / fedora36 – 36
- systemd_project / systemd250 – 251
- systemd_project / systemd252 – 252
- systemd_project / systemd252 – 252
References
- PATCHhttps://github.com/systemd/systemd/commit/076b807be472630692c5348c60d0c2b7b28ad437
- PATCHhttps://github.com/systemd/systemd/pull/25055#issuecomment-1313733553
- PATCHhttps://github.com/systemd/systemd/pull/24853#issuecomment-1326561497
- MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MS5N5SLYAHKENLAJWYBDKU55ICU3SVZF/
Updated 10m ago · 8 sources