Bug 2157281 (CVE-2022-47952)

Summary:	CVE-2022-47952 lxc: information disclosure vulnerability
Product:	[Other] Security Response	Reporter:	ybuenos
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	An information disclosure vulnerability was found in lxc up to 5.0.1. Local users may be able to infer whether any file exists, even within a protected directory tree, via the application's generation of a "Failed to open" error message.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-01-03 03:30:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2157282, 2157283
Bug Blocks:

Description ybuenos 2023-01-01 16:28:30 UTC

lxc-user-nic in lxc through 5.0.1 is installed setuid root, and may allow local users to infer whether any file exists, even within a protected directory tree, because "Failed to open" often indicates that a file does not exist, whereas "does not refer to a network namespace path" often indicates that a file exists. NOTE: this is different from CVE-2018-6556 because the CVE-2018-6556 fix design was based on the premise that "we will report back to the user that the open() failed but the user has no way of knowing why it failed"; however, in many realistic cases, there are no plausible reasons for failing except that the file does not exist.

https://github.com/MaherAzzouzi/CVE-2022-47952
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591/comments/45
https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/lxc.spec.in#L274
https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/src/lxc/cmd/lxc_user_nic.c#L1085-L1104

Comment 1 ybuenos 2023-01-01 16:28:46 UTC

Created lxc tracking bugs for this issue:

Affects: epel-all [bug 2157282]
Affects: fedora-all [bug 2157283]

Comment 2 Product Security DevOps Team 2023-01-03 03:30:36 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.