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2019-04 Security Bulletin: Incorrect messages from Juniper Identity Management Service (JIMS) can trigger Denial of Service or firewall bypass conditions for SRX series devices (CVE-2019-0042)

  [JSA10934] Show Article Properties


Product Affected:
This issue affects Juniper Identity Management Service prior to 1.1.4.
Problem:

Juniper Identity Management Service (JIMS) for Windows versions prior to 1.1.4 may send an incorrect message to associated SRX services gateways. This may allow an attacker with physical access to an existing domain connected Windows system to bypass SRX firewall policies, or trigger a Denial of Service (DoS) condition for the network.

This issue applicable only when the Windows Domain Controller's policy is set to audit account logon failures and SRX has any security policies configured with the term "match source-identity authenticated-user".

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

If the issue is being exploited to bypass SRX firewall policies, suspicious or unusual usernames or IP addresses entries may be present in the SRX auth table.

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2019-0042.

Solution:

The following software releases have been updated to resolve this specific issue: 1.1.4 and all subsequent releases.

If suspicious or unusual usernames or IP addresses entries are present in the SRX auth table, they need to be removed from the SRX auth table.

This issue is being tracked as PR 1409607 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround:

On the domain controller(s), edit GPO policy for Computer Configuration -> Policies -> Windows Settings -> Security Settings -> Local Policies -> Audit Policy.

Uncheck "Failure" for "Audit account logon events". This option is unchecked by default.

In the cmd prompt, enter "gpupdate /force" to immediately update the policy change.

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
  • 2019-04-10: Initial Publication.

 

Related Links:
CVSS Score:
5.7 (CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H)
Risk Level:
Medium
Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."