Integer overflow in grub - CVE-2020-14309
Published: July 30, 2020
Vulnerability identifier: #VU32934
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-14309
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: GNU
Affected software:
grub
grub
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to integer overflow when handling symlinks on ext filesustem in grub_squash_read_symlink() function. A local user can create a specially crafted symlink, trigger an integer overflow and crash the system.
How to mitigate CVE-2020-14309
Install updates from vendor's website.