SB2021020219 - Multiple vulnerabilities in OpenWrt wolfSSL implementation

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Main Vulnerability Database SB2021020219

SB2021020219 - Multiple vulnerabilities in OpenWrt wolfSSL implementation

Published: February 2, 2021

Security Bulletin ID SB2021020219
Severity
High
Patch available
NO
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Medium 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Out-of-bounds write (CVE-ID: CVE-2020-36177)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input for certain relationships between key size and digest size within the RsaPad_PSS() function in wolfcrypt/src/rsa.c in wolfSSL. A remote attacker can send specially crafted data to the application, trigger out-of-bounds write and execute arbitrary code on the target system.


2) Resource management error (CVE-ID: CVE-2021-3336)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the DoTls13CertificateVerify() function in tls13.c in wolfSSL continues to process requests after certain anomalous peer behavior, such as sending an ED22519, ED448, ECC, or RSA signature without the corresponding certificate. A remote attacker can abuse this behavior to consume additional system resources and cause denial of service conditions.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References