Knowledge Search


×
 

2017-10 Security Bulletin: Junos: RPD core due to BGP UPDATE with malformed optional transitive attributes (CVE-2017-10618)

  [JSA10820] Show Article Properties


Product Affected:
This issue affects all products and platforms running Junos OS.
Problem:

When the 'bgp-error-tolerance' feature — designed to help mitigate remote session resets from malformed path attributes — is enabled, a BGP UPDATE containing a specifically crafted set of transitive attributes can cause the RPD routing process to crash and restart. Devices with BGP enabled that do not have 'bgp-error-tolerance' configured are not vulnerable to this issue.

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

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-2017-10618.
 

Solution:

The following software releases have been updated to resolve this specific issue: 13.3R10-S2, 14.1R8-S4, 14.1R9, 14.1X50-D185, 14.1X53-D45, 14.1X53-D50, 14.2R7-S7, 14.2R8, 15.1F5-S8, 15.1F6-S7, 15.1R5-S6, 15.1R6-S2, 15.1R7, 15.1X49-D100, 15.1X53-D64, 15.1X53-D70, 16.1R3-S4, 16.1R4-S3, 16.1R5, 16.2R1-S5, 16.2R2, 17.1R1-S3, 17.1R2, 17.2R1-S2, 17.2R2, 17.2X75-D50, 17.3R1, and all subsequent releases.

This issue is being tracked as PR 1279204 and is visible on the Customer Support website.
 

Workaround:

If 'bgp-error-tolerance' is enabled, disabling this option under 'protocols bgp' will mitigate this issue.

Note that when the error handling feature is off, the router is vulnerable to session resets from malformed path attributes. However, this is RFC 4271 compliant behavior.
 

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:
2017-10-11: Initial Publication.

Related Links:
CVSS Score:
5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Risk Level:
Medium
Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."