Integer overflow in GNU Grub2
CVE-2020-14308
In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This leads the function to return invalid memory allocations which can be further used to cause possible integrity, confidentiality and availability impacts during the boot process.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (35.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · 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)
- www.openwall.com/lists/oss-security/2020/07/29/3 (mailing-list, Mailing List, Third Party Advisory)
- 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)
- www.openwall.com/lists/oss-security/2021/09/17/2 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/09/17/4 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/09/21/1 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-14308?
- CVE-2020-14308 is a medium-severity vulnerability in GNU Grub2, classified under Integer Overflow or Wraparound. CVSS score: 6.4/10. Published 2020-07-29.
- How severe is CVE-2020-14308?
- Medium severity. CVSS v3 base score is 6.4 out of 10.
- Is CVE-2020-14308 known to be exploited?
- 27 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.