Buffer overflow in GNU Grub2
CVE-2020-14309
There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- GNU Grub2
- openSUSE Leap — versions 15.1, 15.2
- Grub — versions All grub2 versions before 2.06
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- security.netapp.com/advisory/ntap-20200731-0008/ (Third Party Advisory)
- usn.ubuntu.com/4432-1/ (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html (vendor-advisory, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202104-05 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-14309?
- CVE-2020-14309 is a medium-severity vulnerability in GNU Grub2, classified under Integer Overflow or Wraparound. CVSS score: 6.7/10. Published 2020-07-30.
- How severe is CVE-2020-14309?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2020-14309 known to be exploited?
- 26 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.