SB2018101747 - Authentication bypass in libssh (Alpine package)

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Main Vulnerability Database SB2018101747

SB2018101747 - Authentication bypass in libssh (Alpine package)

Published: October 17, 2018

Security Bulletin ID SB2018101747
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Authentication bypass (CVE-ID: CVE-2018-10933)

The vulnerability allows a remote attacker to bypass authentication on the target system.

The weakness exists due to coding error, when libssh receives the "SSH2_MSG_USERAUTH_SUCCESS" message. A remote attacker can send the SSH server "SSH2_MSG_USERAUTH_SUCCESS" message instead of the "SSH2_MSG_USERAUTH_REQUEST" message that a server usually expects and which libssh uses as a sign that an authentication procedure needs to initiate, bypass authentication procedures and gain access to a server with an SSH connection enabled without having to enter the password.

Remediation

Install update from vendor's website.

References