// For flags

CVE-2023-52440

ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

If authblob->SessionKey.Length is bigger than session key
size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes.
cifs_arc4_crypt copy to session key array from SessionKey from client.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ksmbd: corrige el desbordamiento de slub en ksmbd_decode_ntlmssp_auth_blob() Si authblob->SessionKey.Length es mayor que el tamaño de la clave de sesión (CIFS_KEY_SIZE), puede ocurrir un desbordamiento de slub en los códigos de intercambio de claves. cifs_arc4_crypt copia a la matriz de claves de sesión desde SessionKey del cliente.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.
The specific flaw exists within the processing of session keys. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the kernel.

*Credits: Pumpkin (@u1f383)
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-20 CVE Reserved
  • 2024-02-21 CVE Published
  • 2024-02-21 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.15 < 5.15.145
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.15.145"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.15 < 6.1.52
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.1.52"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.15 < 6.4.15
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.4.15"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.15 < 6.5.2
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.5.2"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.15 < 6.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.6"
en
Affected