Bug 882769 (CVE-2022-45873)

Summary:	<sys-apps/systemd-252.0: deadlock in systemd-coredump
Product:	Gentoo Security	Reporter:	John Helmert III <ajak>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	IN_PROGRESS ---
Severity:	normal	CC:	systemd
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://github.com/systemd/systemd/commit/076b807be472630692c5348c60d0c2b7b28ad437
Whiteboard:	A3 [glsa]
Package list:		Runtime testing required:	---
Bug Depends on:	887749
Bug Blocks:

Description John Helmert III archtester

2022-11-24 15:28:50 UTC

CVE-2022-45873 (https://github.com/systemd/systemd/pull/25055#issuecomment-1313733553):

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.

Seems like this should be backported?

Comment 1 Mike Gilbert gentoo-dev

2022-11-24 15:40:36 UTC

The backport is not trivial; it may be better to wait for a backport upstream, or stabilize systemd-252.

Comment 2 John Helmert III archtester

2023-01-13 20:46:32 UTC

Thanks!