Race condition in Snapd - CVE-2019-11503
Published: April 30, 2019 / Updated: January 29, 2020
Vulnerability identifier: #VU18375
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2019-11503
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: snapcore
Affected software:
Snapd
Snapd
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition when processing symlinks using the chdir() function to restore a working directory. A local user can run snap-confine on a specially crafted symlink and restore files without necessary permissions.
How to mitigate CVE-2019-11503
Install update from vendor's website.