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2016-01: Security Bulletin: Junos: SRX-Series denial of service vulnerability in flowd due to crafted RTSP packets (​​CVE-2016-1262)

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Categories:
Security Advisories ID: JSA10721
Last Updated: 13 Jan 2016
Version: 3.0

Product Affected:
This issue can affect any SRX-Series devices running Junos OS prior to 12.1X46-D45, 12.1X47-D30, 12.3X48-D20, 15.1X49-D30 in either standalone or HA mode.

Problem:
On all SRX-Series devices, when the RTSP ALG (Real Time Streaming Protocol Application Layer Gateway) is enabled, a certain crafted RTSP 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.

Example output "show system core-dumps" will show core file such as:
/var/tmp/flowd_xlr-SPC*_PIC*.core.0.gz (in high-end SRX)
/var/tmp/flowd_octeon_hm.core-tarball.0.tgz (in Branch SRX)

RTSP ALG is enabled by default on branch SRX platforms and disabled by default on high-end SRX platforms.

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-2016-1262.

Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 12.1X46-D45 (pending release), 12.1X47-D30, 12.3X48-D20, 15.1X49-D30 and all subsequent releases.

This issue is being tracked as PR 1116559 and is visible on the Customer Support website.

Workaround:
Disable RTSP ALG services on the device(s).

Implementation:
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:

2016-01-13: Initial publication

Related Links:

CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level:
High

Risk Assessment:
A network based attacker can cause a denial of service condition.

Acknowledgements:
 

 
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