Vulnerability Details : CVE-2020-15707

Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.
Published 2020-07-29 18:15:15
Updated 2021-09-13 14:25:41
Source Canonical Ltd.
View at NVD,   CVE.org
Vulnerability category: OverflowExecute code

Products affected by CVE-2020-15707

Threat overview for CVE-2020-15707

Top countries where our scanners detected CVE-2020-15707
Top open port discovered on systems with this issue 53
IPs affected by CVE-2020-15707 694,341
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2020-15707!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2020-15707

EPSS FAQ
0.14%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 50 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-15707

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.4
 MEDIUM AV:L/AC:M/Au:N/C:P/I:P/A:P
3.4
6.4
 NIST
6.4
 MEDIUM CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
0.5
5.9
 NIST
5.7
 MEDIUM CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
0.5
5.2
 Canonical Ltd.

CWE ids for CVE-2020-15707

  • The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
    Assigned by: nvd@nist.gov (Primary)
  • The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@ubuntu.com (Secondary)

References for CVE-2020-15707

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