grub2 up to 2.05 integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.3$0-$5k0.00

Summaryinfo

A vulnerability was found in grub2 up to 2.05 and classified as critical. This affects an unknown function. The manipulation results in integer overflow. This vulnerability is identified as CVE-2020-14308. An attack on the physical device is feasible. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in grub2 up to 2.05. Affected is an unknown code. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. 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 can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released 07/29/2020 as Bug 1852009 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2020-14308 since 06/17/2020. The exploitability is told to be difficult. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 236631 (Alibaba Cloud Linux 3 : 0026: grub2 (ALINUX3-SA-2021:0026)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.06 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (236631) and CERT Bund (WID-SEC-2022-0553). Once again VulDB remains the best source for vulnerability data.

Affected

  • Ubuntu Linux
  • IBM Security Guardium
  • Open Source Grub
  • Debian Linux
  • Red Hat Enterprise Linux
  • Microsoft Windows
  • Cisco Identity Services Engine (ISE)
  • SUSE Linux
  • Cisco Router
  • Oracle Linux
  • HPE ProLiant
  • Gentoo Linux
  • Palo Alto Networks PAN-OS
  • Avaya Aura Communication Manager
  • Avaya Aura Session Manager
  • Avaya Aura Application Enablement Services
  • Avaya Aura System Manager
  • Avaya Web License Manager
  • Aruba ArubaOS

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.3

VulDB Base Score: 7.1
VulDB Temp Score: 6.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 236631
Nessus Name: Alibaba Cloud Linux 3 : 0026: grub2 (ALINUX3-SA-2021:0026)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: grub2 2.06

Timelineinfo

06/17/2020 🔍
07/29/2020 +42 days 🔍
07/30/2020 +1 days 🔍
03/18/2026 +2057 days 🔍

Sourcesinfo

Advisory: Bug 1852009
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2020-14308 (🔍)
GCVE (CVE): GCVE-0-2020-14308
GCVE (VulDB): GCVE-100-159156
CERT Bund: WID-SEC-2022-0553 - Grub2: Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 07/30/2020 16:41
Updated: 03/18/2026 17:53
Changes: 07/30/2020 16:41 (39), 07/30/2020 16:46 (17), 11/06/2020 14:16 (1), 05/19/2025 19:40 (20), 03/18/2026 17:53 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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