CVE-2022-47952
First published: Sun Jan 01 2023(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linuxcontainers Lxc | <=5.0.1 | |
| <=5.0.1 |
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Reference Links
- https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591/comments/45
- https://github.com/MaherAzzouzi/CVE-2022-47952
- 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
- https://lists.debian.org/debian-lts-announce/2023/08/msg00025.html
Frequently Asked Questions
What is CVE-2022-47952?
CVE-2022-47952 is a vulnerability in lxc through version 5.0.1 that allows local users to infer whether any file exists, even within a protected directory tree.
How severe is CVE-2022-47952?
CVE-2022-47952 has a severity rating of low (3.3).
What software is affected by CVE-2022-47952?
The affected software is Linuxcontainers Lxc up to version 5.0.1.
How can local users exploit CVE-2022-47952?
Local users can exploit CVE-2022-47952 by inferring the existence of files within a protected directory tree.
Are there any known fixes or patches for CVE-2022-47952?
At the moment, there are no known fixes or patches for CVE-2022-47952. It is recommended to monitor the vendor's website and apply any updates or patches as they become available.
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