CVE-2022-45873
First published: Wed Nov 23 2022(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Systemd Project Systemd | >=250<=251 | |
| Systemd Project Systemd | =252-rc1 | |
| Systemd Project Systemd | =252-rc2 | |
| Fedoraproject Fedora | =36 | |
| redhat/systemd | <252 | 252 |
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Reference Links
- https://github.com/systemd/systemd/commit/076b807be472630692c5348c60d0c2b7b28ad437
- https://github.com/systemd/systemd/pull/24853#issuecomment-1326561497
- https://github.com/systemd/systemd/pull/25055#issuecomment-1313733553
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MS5N5SLYAHKENLAJWYBDKU55ICU3SVZF/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2149066
- https://access.redhat.com/errata/RHSA-2023:0954
- https://access.redhat.com/security/cve/cve-2022-45873
- https://bugzilla.redhat.com/show_bug.cgi?id=2149063
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MS5N5SLYAHKENLAJWYBDKU55ICU3SVZF/
Frequently Asked Questions
What is CVE-2022-45873?
CVE-2022-45873 is a vulnerability in systemd which allows local users to achieve a systemd-coredump deadlock by triggering a crash that has a long backtrace, and it occurs in parse_elf_object in shared/elf-util.c.
How severe is CVE-2022-45873?
CVE-2022-45873 has a severity rating of 5.5 (Medium).
How does CVE-2022-45873 affect the affected software?
CVE-2022-45873 affects systemd versions 250 and 251, as well as version 252-rc1 and version 252-rc2. It also affects Fedora 36.
What is the exploitation methodology for CVE-2022-45873?
The exploitation methodology for CVE-2022-45873 is to crash a binary calling the same function recursively and put it in a deeply nested state.
Are there any references available for CVE-2022-45873?
Yes, you can find references for CVE-2022-45873 by visiting the following links: [GitHub commit](https://github.com/systemd/systemd/commit/076b807be472630692c5348c60d0c2b7b28ad437), [GitHub pull request](https://github.com/systemd/systemd/pull/24853#issuecomment-1326561497), [GitHub pull request](https://github.com/systemd/systemd/pull/25055#issuecomment-1313733553).
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