// For flags

CVE-2023-6918

Libssh: missing checks for return values for digests

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

Se encontró un fallo en la capa abstracta de implementación de libssh para operaciones de resumen de mensajes (MD) implementadas por diferentes backends criptográficos compatibles. Los valores de retorno de estos no se verificaron correctamente, lo que podría causar fallas en situaciones de poca memoria, desreferencias NULL, fallas o uso de la memoria no inicializada como entrada para el KDF. En este caso, las claves que no coinciden resultarán en fallas de descifrado/integridad, lo que terminará la conexión.

*Credits: Red Hat would like to thank Jack Weinstein (<mike.code.bb.h@gmail.com>) for reporting this issue.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-12-18 CVE Reserved
  • 2023-12-18 CVE Published
  • 2024-09-16 CVE Updated
  • 2024-11-17 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-252: Unchecked Return Value
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Libssh
Search vendor "Libssh"
 Libssh
Search vendor "Libssh" for product "Libssh"
 >= 0.9.0 < 0.9.8
Search vendor "Libssh" for product "Libssh" and version " >= 0.9.0 < 0.9.8"
-
Affected
Libssh
Search vendor "Libssh"
 Libssh
Search vendor "Libssh" for product "Libssh"
 >= 0.10.0 < 0.10.6
Search vendor "Libssh" for product "Libssh" and version " >= 0.10.0 < 0.10.6"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 38
Search vendor "Fedoraproject" for product "Fedora" and version "38"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 39
Search vendor "Fedoraproject" for product "Fedora" and version "39"
-
Affected
Redhat
Search vendor "Redhat"
 Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
 8.0
Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"
-
Affected
Redhat
Search vendor "Redhat"
 Enterprise Linux
Search vendor "Redhat" for product "Enterprise Linux"
 9.0
Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"
-
Affected