Vulnerability Details : CVE-2020-29373
An issue was discovered in fs/io_uring.c in the Linux kernel before 5.6. It unsafely handles the root directory during path lookups, and thus a process inside a mount namespace can escape to unintended filesystem locations, aka CID-ff002b30181d.
Vulnerability category: Directory traversal
Exploit prediction scoring system (EPSS) score for CVE-2020-29373
Probability of exploitation activity in the next 30 days: 0.05%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 20 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-29373
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:P/I:N/A:N |
3.9
|
2.9
|
NIST |
|
6.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
2.0
|
4.0
|
NIST |
CWE ids for CVE-2020-29373
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-29373
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff002b30181d30cdfbca316dadd099c3ca0d739c
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Vendor Advisory
-
https://bugs.chromium.org/p/project-zero/issues/detail?id=2011
2011 - Linux >=5.3: io_uring: insecure handling of root directory for path lookups - project-zeroExploit;Issue Tracking;Third Party Advisory
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6
Release Notes;Vendor Advisory
Products affected by CVE-2020-29373
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*