SB2020082414 - Multiple vulnerabilities in wolfSSL

Description

This security bulletin contains information about 3 vulnerabilities.

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

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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)

CWE-ID: CWE-310 - Cryptographic Issues

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

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)

CWE-ID: CWE-399 - Resource Management Errors

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

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