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2018-10 Security Bulletin: Junos OS: jdhcpd process crash during processing of specially crafted DHCPv6 message (CVE-2018-0055)

  [JSA10889] Show Article Properties


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.
Problem:

Receipt of a specially crafted DHCPv6 message destined to a Junos OS device configured as a DHCP server in a Broadband Edge (BBE) environment may result in a jdhcpd daemon crash. The daemon automatically restarts without intervention, but a continuous receipt of crafted DHCPv6 packets could leaded to an extended denial of service condition.

This issue only affects Junos OS 15.1 and later. Earlier releases are unaffected by this issue.

Devices are only vulnerable to the specially crafted DHCPv6 message if DHCP services are configured. Devices not configured to act as a DHCP server are not vulnerable to this issue.

Affected releases are Juniper Networks Junos OS:

  • 15.1 versions prior to 15.1R7-S2;
  • 15.1X49 versions prior to 15.1X49-D160;
  • 15.1X53 versions prior to 15.1X53-D235, 15.1X53-D495;
  • 16.1 versions prior to 16.1R4-S11, 16.1R6-S6, 16.1R7-S2;
  • 16.2 versions prior to 16.2R2-S7;
  • 17.1 versions prior to 17.1R2-S9;
  • 17.2 versions prior to 17.2R2-S6;
  • 17.3 versions prior to 17.3R3-S1;
  • 17.4 versions prior to 17.4R1-S5;
  • 18.1 versions prior to 18.1R2-S3;
  • 18.2 versions prior to 18.2R1-S2;
  • 18.2X75 versions prior to 18.2X75-D20.

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-2018-0055.
 

Solution:

The following software releases have been updated to resolve this specific issue: 15.1R7-S2, 15.1X49-D160, 15.1X53-D235, 15.1X53-D495, 16.1R4-S11, 16.1R6-S6, 16.1R7-S2, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.3R3-S1, 17.4R1-S5, 17.4R2, 18.1R2-S3, 18.1R3, 18.2R1-S2, 18.2R2, 18.2X75-D20, 18.3R1, and all subsequent releases.

This issue is being tracked as PR 1368377 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:
Disable DHCP services if they are not needed.
 
Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
‚Äč2018-10-10: Initial publication

Related Links:
CVSS Score:
6.5 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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."