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2020-04 Security Bulletin: Junos OS: SRX Series: Unified Access Control (UAC) bypass vulnerability (CVE-2020-1637)

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Article ID: JSA11018 SECURITY_ADVISORIES Last Updated: 08 Apr 2020Version: 1.0
Product Affected:
This issue affects Junos OS 12.3X48, 15.1X49, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4. Affected platforms: SRX Series.
Problem:

A vulnerability in Juniper Networks SRX Series device configured as a Junos OS Enforcer device may allow a user to access network resources that are not permitted by a UAC policy.

This issue might occur when the IP address range configured in the Infranet Controller (IC) is configured as an IP address range instead of an IP address/netmask. See the Workaround section for more detail.

The Junos OS Enforcer CLI settings are disabled by default.

This issue affects Juniper Networks Junos OS on SRX Series:

12.3X48 versions prior to 12.3X48-D100;

15.1X49 versions prior to 15.1X49-D210;

17.3 versions prior to 17.3R2-S5, 17.3R3-S8;

17.4 versions prior to 17.4R2-S9, 17.4R3-S1;

18.1 versions prior to 18.1R3-S10;

18.2 versions prior to 18.2R2-S7, 18.2R3-S3;

18.3 versions prior to 18.3R1-S7, 18.3R3-S2;

18.4 versions prior to 18.4R1-S6, 18.4R2-S4, 18.4R3-S1;

19.1 versions prior to 19.1R1-S4, 19.1R2-S1, 19.1R3;

19.2 versions prior to 19.2R1-S3, 19.2R2;

19.3 versions prior to 19.3R2-S1, 19.3R3;

19.4 versions prior to 19.4R1-S1, 19.4R2.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2020-1637.

Solution:

The following software releases have been updated to resolve this specific issue: 12.3X48-D100, 15.1X49-D210, 16.1R7-S7, 17.3R2-S5, 17.3R3-S8, 17.4R2-S9, 17.4R3-S1, 18.1R3-S10, 18.2R2-S7, 18.2R3-S3, 18.3R1-S7, 18.3R3-S2, 18.4R1-S6, 18.4R2-S4, 18.4R3-S1, 19.1R1-S4, 19.1R2-S1, 19.1R3, 19.2R1-S3, 19.2R2, 19.3R2-S1, 19.3R3, 19.4R1-S1, 19.4R2, 20.1R1, and all subsequent releases.

This issue is being tracked as 1475435.

Workaround:

To avoid this issue, the IP address configuration in the IC Server should be configured as IP address/netmask, rather than an IP address range.

For example: configure 10.0.0.0/25 instead of 10.0.0.1-127.

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
‚Äč2020-04-08: Initial publication
CVSS Score:
7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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