SB2020082414 - Multiple vulnerabilities in wolfSSL

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Infinite loop (CVE-ID: CVE-2020-12457)

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

The vulnerability exists due to improper change_cipher_spec (CCS) message processing logic for TLS 1.3. A remote attacker can send ChangeCipherSpec messages in a crafted way involving more than one in a row and perform a denial of service (DoS) attack.

2) Cryptographic issues (CVE-ID: CVE-2020-15309)

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in wolfSSL when single precision is not employed. A local user can conduct a cache-timing attack against public key operations. These attackers may already have obtained sensitive information if the affected system has been used for private key operations (e.g., signing with a private key).

3) Resource management error (CVE-ID: CVE-2020-24585)

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

The vulnerability exists due to improper management of internal resources with the application within the DTLS handshake implementation in wolfSSL. Clear DTLS application_data messages in epoch 0 do not produce an out-of-order error. Instead, these messages are returned to the application.

Remediation

Install update from vendor's website.

References

• https://github.com/wolfSSL/wolfssl/pull/2927
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-stable
• https://github.com/wolfSSL/wolfssl/pull/3219