Buffer overflow in Gnu Grub2
CVE-2020-14311
There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.
Vulnerability class: Buffer Overflow
EPSS: 0.005 (37.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Gnu Grub2
- The Grub2 Project — versions 2.06
- Canonical Ubuntu_linux — versions 14.04, 16.04, 18.04
- Opensuse Leap — versions 15.1, 15.2
- Redhat Enterprise_linux — versions 7.0, 8.0
- Redhat Enterprise_linux_eus — versions 8.1, 8.2
- Redhat Enterprise_linux_server_aus — versions 8.2
- Redhat Enterprise_linux_server_tus — versions 8.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- secalert@redhat.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-14311?
- CVE-2020-14311 is a medium-severity vulnerability in Gnu Grub2, classified under Heap-based Buffer Overflow. CVSS score: 5.7/10. Published 2020-07-31.
- How severe is CVE-2020-14311?
- Medium severity. CVSS v3 base score is 5.7 out of 10.
- Is CVE-2020-14311 known to be exploited?
- 27 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.