// For flags

CVE-2023-40548

Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems

Severity Score

7.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.

Se encontró un desbordamiento de búfer en Shim en el sistema de 32 bits. El desbordamiento ocurre debido a una operación de suma que involucra un valor controlado por el usuario analizado del binario PE que utiliza Shim. Este valor se utiliza además para operaciones de asignación de memoria, lo que provoca un desbordamiento de búfer en la región Heap de la memoria. Esta falla causa daños en la memoria y puede provocar fallas o problemas de integridad de los datos durante la fase de inicio.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-08-15 CVE Reserved
  • 2024-01-29 CVE Published
  • 2024-04-18 EPSS Updated
  • 2024-10-01 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-190: Integer Overflow or Wraparound
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Redhat
Search vendor "Redhat"
 Shim
Search vendor "Redhat" for product "Shim"
 < 15.8
Search vendor "Redhat" for product "Shim" and version " < 15.8"
-
Affected
Redhat
Search vendor "Redhat"
 Shim
Search vendor "Redhat" for product "Shim"
 15.8
Search vendor "Redhat" for product "Shim" and version "15.8"
rc1
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 39
Search vendor "Fedoraproject" for product "Fedora" and version "39"
-
Affected