ID CVE-2015-7755
Summary Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before 6.3.0r13b, 6.3.0r14 before 6.3.0r14b, 6.3.0r15 before 6.3.0r15b, 6.3.0r16 before 6.3.0r16b, 6.3.0r17 before 6.3.0r17b, 6.3.0r18 before 6.3.0r18b, 6.3.0r19 before 6.3.0r19b, and 6.3.0r20 before 6.3.0r21 allows remote attackers to obtain administrative access by entering an unspecified password during a (1) SSH or (2) TELNET session.
Vulnerable Configurations
  • Juniper Networks ScreenOS 6.3.0 R17
  • Juniper Networks ScreenOS 6.3.0 R18
  • Juniper Networks ScreenOS 6.3.0 R19
  • Juniper Networks ScreenOS 6.3.0 R20
Base: 10.0
Impact: -
  • Exploiting Trust in Client (aka Make the Client Invisible)
    ["An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client.", 'An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client.', 'There are numerous variations of this type of attack.']
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    ["This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated.", "Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme."]
  • Man in the Middle Attack
    ['This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.']
  • Authentication Abuse
    ['An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme\'s implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target\'s authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.']
Msf vFeed
msf_script_file metasploit-framework/modules/auxiliary/scanner/ssh/juniper_backdoor.rb
msf_script_name Juniper SSH Backdoor Scanner
msfid juniper_backdoor.rb
Nessus vFeed
nessus_script_family Default Unix Accounts
nessus_script_file screenos_ssh_auth_bypass.nasl
nessus_script_id 87601
nessus_script_name Juniper ScreenOS SSH / Telnet Authentication Backdoor
Openvas vFeed
openvas_script_family General
openvas_script_file gb_juniper_screenos_JSA10713.nasl
openvas_script_id 841200
openvas_script_name Multiple Security issues with ScreenOS (JSA10713)
Scip vFeed
scipid 79855
Suricata vFeed
suricata_classtype policy-violation
suricata_id sid:2022299
suricata_sig ET POLICY FOX-SRT - Juniper ScreenOS SSH World Reachable
Last major update 19-12-2015 - 14:59
Published 19-12-2015 - 14:59
Last modified 07-12-2016 - 18:25
Back to Top