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2012-07 Security Bulletin: Junos: rpd process can hang following a specific PIM broadcast storm

  [JSA10447] Show Article Properties


Legacy Advisory Id:
PSN-2012-07-648
Product Affected:
This issue can affect all Junos routers with PIM enabled in a Rosen MVPN configuration.
Problem:

A specially crafted broadcast storm of corrupt packets sent to the data multicast distribution tree (MDT) port of a Junos router will eventually cause the rpd daemon to hang. Routing-related CLI commands become unresponsive, and the rpd process must be killed to recover. This issue only affects routers with PIM enabled in a Rosen MVPN configuration.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

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

The rpd daemon now skips the remaining data MDT packet processing if it encounters inconsistent header values.

All Junos OS software releases built on or after 2012-05-30 have fixed this specific issue. Releases containing the fix specifically include: 10.0S25, 10.4R10, 11.2R7, 11.3R6, 11.4R3, 12.1R2 and all subsequent releases (i.e. all releases built after 12.1R2).

This issue is being tracked as PR 742338 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:

Configure or modify a control plane (loopback) firewall filter to explicitly block UDP traffic to port 3232 if data MDTs are not used, or use access lists to allow access to the control plane only from trusted hosts.
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.
Related Links:
CVSS Score:
6.1 (AV:A/AC:L/Au:N/C:N/I:N/A:C)
Severity Level:
Medium
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."