Vulnerability Note VU#640184
Juniper ScreenOS contains multiple vulnerabilities
Original Release date: 21 Dec 2015 | Last revised: 22 Dec 2015

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.

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.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedJuniper NetworksAffected21 Dec 201521 Dec 2015If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
10.0
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
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7755
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7756
http://blog.cryptographyengineering.com/2015/12/on-juniper-backdoor.html
https://rpw.sh/blog/2015/12/21/the-backdoored-backdoor/

Credit

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:
17 Dec 2015

Date First Published:
21 Dec 2015

Date Last Updated:
22 Dec 2015

Document Revision:
32

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