2019-04 Security Bulletin: Junos OS: jdhcpd crash upon receipt of crafted DHCPv6 solicit message (CVE-2019-0037)

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Product Affected:
This issue affects Junos OS 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3.
Problem:

In a Dynamic Host Configuration Protocol version 6 (DHCPv6) environment, the jdhcpd daemon may crash and restart upon receipt of certain DHCPv6 solicit messages received from a DHCPv6 client. By continuously sending the same crafted packet, an attacker can repeatedly crash the jdhcpd process causing a sustained Denial of Service (DoS) to both IPv4 and IPv6 clients.

Affected releases are Juniper Networks Junos OS:

  • 15.1 versions prior to 15.1F6-S12, 15.1R7-S3;
  • 15.1X49 versions prior to 15.1X49-D171, 15.1X49-D180;
  • 15.1X53 versions prior to 15.1X53-D236, 15.1X53-D496;
  • 16.1 versions prior to 16.1R3-S10, 16.1R7-S4;
  • 16.2 versions prior to 16.2R2-S8;
  • 17.1 versions prior to 17.1R2-S10, 17.1R3;
  • 17.2 versions prior to 17.2R1-S8, 17.2R3-S1;
  • 17.3 versions prior to 17.3R3-S3;
  • 17.4 versions prior to 17.4R1-S6, 17.4R2-S3;
  • 18.1 versions prior to 18.1R2-S4, 18.1R3-S2;
  • 18.2 versions prior to 18.2R2;
  • 18.2X75 versions prior to 18.2X75-D30;
  • 18.3 versions prior to 18.3R1-S2.

This issue does not affect Junos OS releases prior to 15.1.

Sample configuration:

user@host# edit system services dhcp-local-server dhcpv6

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-2019-0037.
 

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 15.1F6-S12, 15.1R7-S3, 15.1X49-D171, 15.1X49-D180, 15.1X53-D236, 15.1X53-D496, 16.1R3-S10, 16.1R7-S4, 16.2R2-S8, 17.1R2-S10, 17.1R3, 17.2R1-S8, 17.2R3-S1, 17.3R3-S3, 17.4R1-S6, 17.4R2-S3, 18.1R2-S4, 18.1R3-S2, 18.2R2, 18.2X75-D30, 18.3R1-S2, 18.4R1, and all subsequent releases.

This issue is being tracked as PR 1391983 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:

No known workaround exists for this issue.
 

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:
7.4 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
Risk Level:
High
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."