// For flags

CVE-2019-18840

 

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In wolfSSL 4.1.0 through 4.2.0c, there are missing sanity checks of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer overflow inside the DecodedCert structure in GetName in wolfcrypt/src/asn.c because the domain name location index is mishandled. Because a pointer is overwritten, there is an invalid free.

En wolfSSL versiones 4.1.0 hasta 4.2.0c, faltan comprobaciones de saneamiento de los accesos a la memoria en el análisis de los datos del certificado ASN.1 durante el protocolo de enlace. Específicamente, se presenta un desbordamiento de búfer en la región heap de la memoria por un byte dentro de la estructura de DecodedCert en GetName en el archivo wolfcrypt/src/asn.c porque el índice de ubicación del nombre de dominio es manejado inapropiadamente. Debido a que un puntero es sobrescrito, se presenta una liberación no válida.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-11-09 CVE Reserved
  • 2019-11-09 CVE Published
  • 2023-03-07 EPSS Updated
  • 2024-08-05 CVE Updated
  • 2024-08-05 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-787: Out-of-bounds Write
CAPEC
References (1)
URL Tag Source
URL Date SRC
https://github.com/wolfSSL/wolfssl/issues/2555 2024-08-05
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Wolfssl
Search vendor "Wolfssl"
 Wolfssl
Search vendor "Wolfssl" for product "Wolfssl"
 >= 4.1.0 <= 4.2.0c
Search vendor "Wolfssl" for product "Wolfssl" and version " >= 4.1.0 <= 4.2.0c"
-
Affected