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2017-07 Security Bulletin: Junos: SRX Series denial of service vulnerability in flowd due to crafted DHCP packet (CVE-2017-10605)

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Article ID: JSA10789 SECURITY_ADVISORIES Last Updated: 14 Jul 2017Version: 3.0
Product Affected:
This issue affects Junos OS 12.1X46, 12.3X48, 15.1X49. Affected platforms: vSRX or SRX Series with DHCP or DHCP relay configured.
Problem:

On all vSRX and SRX Series devices, when the DHCP or DHCP relay is configured, specially crafted packet might cause the flowd process to crash, halting or interrupting traffic from flowing through the device(s).

Repeated crashes of the flowd process may constitute an extended denial of service condition for the device(s).

If the device is configured in high-availability, the RG1+ (data-plane) will fail-over to the secondary node.

If the device is configured in stand-alone, there will be temporary traffic interruption until the flowd process is restored automatically.

Sustained crafted packets may cause the secondary failover node to fail back, or fail completely, potentially halting flowd on both nodes of the cluster or causing flip-flop failovers to occur.

No other Juniper Networks products or platforms are affected by this issue.

This issue only affects devices with DHCP or DHCP relay is configured.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability, however, the issue has been seen in a production network.

This issue has been assigned CVE-2017-10605.

Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.1x46-D67, 12.3X48-D50, 15.1X49-D91, 15.1X49-D100 and all subsequent releases.

This issue is being tracked as PR 1270493 and is visible on the Customer Support website.

KB16765 - "In which releases are vulnerabilities fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.
 
Workaround:
No published workaround exists for this issue.
 
Implementation:
How to obtain fixed software:

Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service  Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of "PRs fixed" can be provided on request.
 
Modification History:
  • 2017-07-12: Initial Publication.
  • 2017-07-14: Correction, Solution section resolved in 12.3X48-D50.
CVSS Score:
8.6 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
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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