CVE-2022-47952
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…
Does this matter?
Lower severity and a low EPSS score (0.70%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 3.3 LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.70% probability · 51th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- linuxcontainers/lxc
- Source
- cve@mitre.org
References
- https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591/comments/45Issue Tracking, Vendor Advisory
- https://github.com/MaherAzzouzi/CVE-2022-47952Third Party Advisory
- https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/lxc.spec.in#L274Third Party Advisory
- https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/src/lxc/cmd/lxc_user_nic.c#L1085-L1104Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/08/msg00025.html
- https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591/comments/45Issue Tracking, Vendor Advisory
- https://github.com/MaherAzzouzi/CVE-2022-47952Third Party Advisory
- https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/lxc.spec.in#L274Third Party Advisory
- https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/src/lxc/cmd/lxc_user_nic.c#L1085-L1104Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/08/msg00025.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.