Juniper ScreenOS contains multiple vulnerabilities

Overview

Juniper Networks ScreenOS versions 6.3.0r17 through 6.3.0r20 allows unauthorized remote administration access to the device. Juniper Networks ScreenOS versions 6.2.0r15 through 6.2.0r18 and 6.3.0r12 through 6.3.0r20 allow for an attacker to monitor and decrypt VPN traffic.

Description

According to Juniper Security Advisory #10713:

During an internal code review, two security issues were identified.

_Administrative Access (CVE-2015-7755) allows unauthorized remote administrative access to the device. Exploitation of this vulnerability can lead to complete compromise of the affected device. _

This issue only affects ScreenOS 6.3.0r17 through 6.3.0r20. No other Juniper products or versions of ScreenOS are affected by this issue.

_This issue has been assigned _CVE-2015-7755

VPN Decryption (CVE-2015-7756) may allow a knowledgeable attacker who can monitor VPN traffic to decrypt that traffic. It is independent of the first issue.

This issue affects ScreenOS 6.2.0r15 through 6.2.0r18 and 6.3.0r12 through 6.3.0r20. No other Juniper products or versions of ScreenOS are affected by this issue.

There is no way to detect that this vulnerability was exploited.

This issue has been assigned CVE-2015-7756.

Juniper SIRT is not aware of any malicious exploitation of these vulnerabilities, however the password needed for the administrative access has been revealed publicly.

No other Juniper Networks products or platforms are affected by these issues.
For more information, please see Juniper Security Advisory #10713.

Impact

An unauthorized remote attacker could gain privileged access to the device and compromise the confidentiality and integrity of its data.

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Solution

Apply an update

Juniper has issued guidance to install the patched versions of ScreenOS.

Restrict Access

As a general good security practice, only allow connections from trusted hosts and networks.

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Vendor Information

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Juniper Networks Affected

Notified: December 21, 2015 Updated: December 21, 2015

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713&cat=SIRT_1&actp=LIST

CVSS Metrics

Group	Score	Vector
Base	10	AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal	8.3	E:F/RL:OF/RC:C
Environmental	6.2	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713&cat=SIRT_1&actp=LIST
• http://kb.juniper.net/InfoCenter/index?page=content&id=KB16765&actp=search
• http://kb.juniper.net/InfoCenter/index?page=content&id=KB16446&actp=search
• <https://vulners.com/cve/CVE-2015-7755&gt;
• <https://vulners.com/cve/CVE-2015-7756&gt;
• <http://blog.cryptographyengineering.com/2015/12/on-juniper-backdoor.html&gt;
• <https://rpw.sh/blog/2015/12/21/the-backdoored-backdoor/&gt;

Acknowledgements

Thanks to the Juniper SIRT Team.

This document was written by Brian Gardiner.

Other Information

CVE IDs:	CVE-2015-7755, CVE-2015-7756
Date Public:	2015-12-17 Date First Published: