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Security Activity Bulletin

Rlogin Multiple User Account Unauthorized Access Issues

 
Threat Type:CWE-287: Authentication Issues
IntelliShield ID:27567
Version:1
First Published:2012 December 07 16:46 GMT
Last Published:2012 December 07 16:46 GMT
Port: Not available
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
Related Resources:
 
 
Version Summary:Certain configurations of rlogind could allow a remote attacker to gain unauthorized access to a targeted system.
 

Description
 
If a trusted host or trusted users have been established, rlogin and rsh services allow a user to log in or execute commands without authentication. A trusted host is set up by placing the name of a specific host or a plus symbol in the file /etc/hosts.equiv. Trusted users will have the .rhosts file in their home directory, which contains the names of trusted hosts the user may log in to. Two pluses (+ +) in this file will allow any user from any machine to log in.

In most environments, rsh and rlogin are often considered deprecated and insecure as they offer no transport security and transmit username and password information in clear text. On production systems, the services are likely disabled, removing any potential for exploitation. Administrators should use secure remote terminals such as SSH in place of rsh and rlogin.

Certain configurations of rlogind could allow a remote attacker to gain unauthorized access to a targeted system via the root, guest or nobody user accounts. A successful attack could allow the attacker to use the unauthorized system access for malicious activity or to launch additional attacks.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability. IPS and IDS devices may detect and block attempts to access the rsh and rlogin services and their related hosts.equiv and .rhosts files as potential exploit activity.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
IntelliShieldSecurity Activity Bulletin Original Release Base

Associated Products:
N/A




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