SB2018120401 - Cache Attacks in TLS
Published: December 4, 2018 Updated: February 11, 2019
Security Bulletin ID
SB2018120401
Severity
Medium
Patch available
YES
Number of vulnerabilities
5
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Cache Attacks (CVE-ID: CVE-2018-12404)
The vulnerability allows a remote attacker to perform a downgrade attack on the server and decrypt private keys on the target system.The vulnerability exists due to a core weakness in TLS that relates to the handshaking of the session key which is used within the tunnel during parallelisation of thousands of oracle queries that occurs using a cluster of TLS servers which share the same public key certificate. A remote attacker can mount a microarchitectural side channel attack against a vulnerable implementation, obtain a network man-in-the-middle position, obtain the relevant data to sign and trigger the victim server to decrypt ciphertexts chosen by the adversary to perform a downgrade attack.
2) Cache Attacks (CVE-ID: CVE-2018-19608)
The vulnerability allows a remote attacker to perform a downgrade attack on the server and decrypt private keys on the target system.The vulnerability exists due to a core weakness in TLS that relates to the handshaking of the session key which is used within the tunnel during parallelisation of thousands of oracle queries that occurs using a cluster of TLS servers which share the same public key certificate. A remote attacker can mount a microarchitectural side channel attack against a vulnerable implementation, obtain a network man-in-the-middle position, obtain the relevant data to sign and trigger the victim server to decrypt ciphertexts chosen by the adversary to perform a downgrade attack.
3) Cache Attacks (CVE-ID: CVE-2018-16868)
The vulnerability allows a remote attacker to perform a downgrade attack on the server and decrypt private keys on the target system.The vulnerability exists due to a core weakness in TLS that relates to the handshaking of the session key which is used within the tunnel during parallelisation of thousands of oracle queries that occurs using a cluster of TLS servers which share the same public key certificate. A remote attacker can mount a microarchitectural side channel attack against a vulnerable implementation, obtain a network man-in-the-middle position, obtain the relevant data to sign and trigger the victim server to decrypt ciphertexts chosen by the adversary to perform a downgrade attack.
4) Cache Attacks (CVE-ID: CVE-2018-16869)
The vulnerability allows a remote attacker to perform a downgrade attack on the server and decrypt private keys on the target system.The vulnerability exists due to a core weakness in TLS that relates to the handshaking of the session key which is used within the tunnel during parallelisation of thousands of oracle queries that occurs using a cluster of TLS servers which share the same public key certificate. A remote attacker can mount a microarchitectural side channel attack against a vulnerable implementation, obtain a network man-in-the-middle position, obtain the relevant data to sign and trigger the victim server to decrypt ciphertexts chosen by the adversary to perform a downgrade attack.
5) Cache Attacks (CVE-ID: CVE-2018-16870)
The vulnerability allows a remote attacker to perform a downgrade attack on the server and decrypt private keys on the target system.The vulnerability exists due to a core weakness in TLS that relates to the handshaking of the session key which is used within the tunnel during parallelisation of thousands of oracle queries that occurs using a cluster of TLS servers which share the same public key certificate. A remote attacker can mount a microarchitectural side channel attack against a vulnerable implementation, obtain a network man-in-the-middle position, obtain the relevant data to sign and trigger the victim server to decrypt ciphertexts chosen by the adversary to perform a downgrade attack.
Remediation
Install update from vendor's website.