SB2018042443 - Multiple vulnerabilities in N series Products
Published: April 24, 2018 Updated: May 31, 2023
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) NULL pointer dereference (CVE-ID: CVE-2017-3730)
The vulnerability allows a remote attacker to cause denial of service.
The vulnerability exists in OpenSSL due to NULL pointer dereference error when processing specially crafted parameters for a Diffie-Hellman Key Exchange (DHE) or Elliptic Curve Diffie-Hellman Exchange (ECDHE), received from malicious server. A remote attacker can trick the victim into connecting to a specially crafted website and trigger NULL pointer dereference error in client software.
Successful exploitation of the vulnerability may allow an attacker to perform denial of service (DoS) attack against vulnerable client software.
2) Out-of-bounds read (CVE-ID: CVE-2017-3731)
The vulnerability allows a remote attacker to cause denial of service conditions.
The vulnerability exists due to out-of-bounds read in OpenSSL when processing truncated packets on 32-bit system using certain ciphers. A remote attacker can send a specially crafted truncated packet using CHACHA20/POLY1305 cipher for OpenSSL 1.1.0 or RC4-MD5 for 1.0.2 and trigger denial of service.
Successful exploitation of the vulnerability may allow an attacker to perform denial of service (DoS) attack against vulnerable system.
3) Information disclosure (CVE-ID: CVE-2017-3732)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to propagating error in the x86_64 Montgomery squaring procedure. A remote attacker with access to unpatched vulnerable system that uses a shared private key with Diffie-Hellman (DH) parameters set can gain unauthorized access to sensitive private key information.
According to vendor’s advisory, this vulnerability is unlikely to be exploited in real-world attacks, as it requires significant resources and online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients.
Vulnerability exploitation against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely.
4) Information disclosure (CVE-ID: CVE-2016-7055)
The vulnerability allows a remote attacker to decrypt certain data.
The vulnerability exists in OpenSSL implementation due to propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits. A remote attacker can launch attacks against RSA, DSA and DH private keys and decrypt information, passed over encrypted channels. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation.
Successful exploitation of the vulnerability may allow an attacker in certain conditions to launch attacks against OpenSSL clients.
Remediation
Install update from vendor's website.