CVE-2020-1628

Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an EX4300 switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D53 on EX4300; 15.1 versions prior to 15.1R7-S6 on EX4300; 15.1X49 versions prior to 15.1X49-D200, 15.1X49-D210 on EX4300; 16.1 versions prior to 16.1R7-S7 on EX4300; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2 on EX4300; 17.2 versions prior to 17.2R3-S3 on EX4300; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on EX4300; 17.4 versions prior to 17.4R2-S9, 17.4R3 on EX4300; 18.1 versions prior to 18.1R3-S8 on EX4300; 18.2 versions prior to 18.2R3-S2 on EX4300; 18.3 versions prior to 18.3R2-S3, 18.3R3, 18.3R3-S1 on EX4300; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3 on EX4300; 19.1 versions prior to 19.1R1-S4, 19.1R2 on EX4300; 19.2 versions prior to 19.2R1-S4, 19.2R2 on EX4300; 19.3 versions prior to 19.3R1-S1, 19.3R2 on EX4300.

Weakness

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Affected Software

Extended Description

There are many different kinds of mistakes that introduce information exposures. The severity of the error can range widely, depending on the context in which the product operates, the type of sensitive information that is revealed, and the benefits it may provide to an attacker. Some kinds of sensitive information include:

Information might be sensitive to different parties, each of which may have their own expectations for whether the information should be protected. These parties include:

Information exposures can occur in different ways:

It is common practice to describe any loss of confidentiality as an “information exposure,” but this can lead to overuse of CWE-200 in CWE mapping. From the CWE perspective, loss of confidentiality is a technical impact that can arise from dozens of different weaknesses, such as insecure file permissions or out-of-bounds read. CWE-200 and its lower-level descendants are intended to cover the mistakes that occur in behaviors that explicitly manage, store, transfer, or cleanse sensitive information.

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/116.html
• https://cwe.mitre.org/data/definitions/13.html
• https://cwe.mitre.org/data/definitions/169.html
• https://cwe.mitre.org/data/definitions/22.html
• https://cwe.mitre.org/data/definitions/224.html
• https://cwe.mitre.org/data/definitions/285.html
• https://cwe.mitre.org/data/definitions/287.html
• https://cwe.mitre.org/data/definitions/290.html
• https://cwe.mitre.org/data/definitions/291.html
• https://cwe.mitre.org/data/definitions/292.html
• https://cwe.mitre.org/data/definitions/293.html
• https://cwe.mitre.org/data/definitions/294.html
• https://cwe.mitre.org/data/definitions/295.html
• https://cwe.mitre.org/data/definitions/296.html
• https://cwe.mitre.org/data/definitions/297.html
• https://cwe.mitre.org/data/definitions/298.html
• https://cwe.mitre.org/data/definitions/299.html
• https://cwe.mitre.org/data/definitions/300.html
• https://cwe.mitre.org/data/definitions/301.html
• https://cwe.mitre.org/data/definitions/302.html
• https://cwe.mitre.org/data/definitions/303.html
• https://cwe.mitre.org/data/definitions/304.html
• https://cwe.mitre.org/data/definitions/305.html
• https://cwe.mitre.org/data/definitions/306.html
• https://cwe.mitre.org/data/definitions/307.html
• https://cwe.mitre.org/data/definitions/308.html
• https://cwe.mitre.org/data/definitions/309.html
• https://cwe.mitre.org/data/definitions/310.html
• https://cwe.mitre.org/data/definitions/312.html
• https://cwe.mitre.org/data/definitions/313.html
• https://cwe.mitre.org/data/definitions/317.html
• https://cwe.mitre.org/data/definitions/318.html
• https://cwe.mitre.org/data/definitions/319.html
• https://cwe.mitre.org/data/definitions/320.html
• https://cwe.mitre.org/data/definitions/321.html
• https://cwe.mitre.org/data/definitions/322.html
• https://cwe.mitre.org/data/definitions/323.html
• https://cwe.mitre.org/data/definitions/324.html
• https://cwe.mitre.org/data/definitions/325.html
• https://cwe.mitre.org/data/definitions/326.html
• https://cwe.mitre.org/data/definitions/327.html
• https://cwe.mitre.org/data/definitions/328.html
• https://cwe.mitre.org/data/definitions/329.html
• https://cwe.mitre.org/data/definitions/330.html
• https://cwe.mitre.org/data/definitions/472.html
• https://cwe.mitre.org/data/definitions/497.html
• https://cwe.mitre.org/data/definitions/508.html
• https://cwe.mitre.org/data/definitions/573.html
• https://cwe.mitre.org/data/definitions/574.html
• https://cwe.mitre.org/data/definitions/575.html
• https://cwe.mitre.org/data/definitions/576.html
• https://cwe.mitre.org/data/definitions/577.html
• https://cwe.mitre.org/data/definitions/59.html
• https://cwe.mitre.org/data/definitions/60.html
• https://cwe.mitre.org/data/definitions/616.html
• https://cwe.mitre.org/data/definitions/643.html
• https://cwe.mitre.org/data/definitions/646.html
• https://cwe.mitre.org/data/definitions/651.html
• https://cwe.mitre.org/data/definitions/79.html

References

• https://kb.juniper.net/JSA11008
• https://kb.juniper.net/JSA11008