CVE-2018-0055

Junos OS: jdhcpd process crash during processing of specially crafted DHCPv6 message

Description

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.

Remediation

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.

Workaround:

  • Disable DHCP services if they are not needed.

Category

6.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.24%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://kb.juniper.net/JSA10889 vendor advisory
http://www.securitytracker.com/id/1041856 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-0055?
CVE-2018-0055 has been scored as a medium severity vulnerability.
How to fix CVE-2018-0055?
To fix CVE-2018-0055: 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.
Is CVE-2018-0055 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-0055 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-0055?
CVE-2018-0055 affects Juniper Networks Junos OS.
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