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AUSCERT External Security Bulletin Redistribution
Junos: SRX flowd denial of service vulnerability related to
9 October 2014
AusCERT Security Bulletin Summary
Product: Juniper SRX Series
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2014-3825
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2014-10 Security Bulletin: Junos: SRX flowd denial of service vulnerability
related to ALGs (CVE-2014-3825)
Security Advisories ID: JSA10650
Last Updated: 08 Oct 2014
This issue can affect all SRX Series services gateways.
On SRX Series devices, when any ALG (Application Layer Gateway) is enabled, a
certain crafted packet may cause the flowd process to crash. Repeated crashes
of the flowd process constitutes an extended denial of service condition for
the SRX Series device. The status of ALGs can be obtained by executing the
'show security alg status' CLI command.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
No other Juniper Networks products or platforms are affected by this issue.
This issue has been assigned CVE-2014-3825.
The following software releases have been updated to resolve this specific
issue: Junos OS 11.4R12-S4, 12.1X44-D40, 12.1X45-D30, 12.1X46-D25,
12.1X47-D10, and all subsequent releases.
This issue is being tracked as PR 986369 and is visible on the Customer
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.
Two available workarounds exist for this issue:
Disable ALGs using the CLI command 'set security alg ____ disable' if ALGs are
Enable flow-based processing for IPv6 traffic using the CLI command 'set
security forwarding-options family inet6 mode flow-based' command (a device
reboot is required)
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.
KB16613: Overview of the Juniper Networks SIRT Monthly Security Bulletin
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Report a Vulnerability - How to Contact the Juniper Networks Security Incident
CVE-2014-3825: SRX flowd denial of service vulnerability related to SIP ALG
Information for how Juniper Networks uses CVSS can be found at KB 16446
"Common Vulnerability Scoring System (CVSS) and Juniper's Security
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