Product Affected

This issue affects all products and platforms running Junos OS.
High
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Problem

On Junos devices with the BGP graceful restart helper mode enabled or the BGP graceful restart mechanism enabled, a certain sequence of BGP session restart on a remote peer that has the graceful restart mechanism enabled may cause the local routing protocol daemon (RPD) process to crash and restart. Repeated crashes of the RPD process can cause prolonged Denial of Service (DoS).

Graceful restart helper mode for BGP is enabled by default.

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

Affected releases are Juniper Networks Junos OS:

  • 16.1 versions prior to 16.1R7-S3;
  • 16.2 versions prior to 16.2R2-S9;
  • 17.1 versions prior to 17.1R3;
  • 17.2 versions prior to 17.2R3;
  • 17.2X75 versions prior to 17.2X75-D105;
  • 17.3 versions prior to 17.3R3-S2;
  • 17.4 versions prior to 17.4R1-S7, 17.4R2-S2, 17.4R3;
  • 18.1 versions prior to 18.1R3-S2;
  • 18.2 versions prior to 18.2R2;
  • 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D30;
  • 18.3 versions prior to 18.3R1-S4, 18.3R2.


Junos OS releases prior to 16.1R1 are not affected.

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

This issue was seen during production usage.

This issue has been assigned CVE-2019-0049 .
 

Solution

The following software releases have been updated to resolve this specific issue: 16.1R7-S3, 16.2R2-S9, 17.1R3, 17.2R3, 17.2X75-D105, 17.3R3-S2, 17.4R1-S7, 17.4R2-S2, 17.4R3, 18.1R3-S2, 18.2R2, 18.2X75-D12, 18.2X75-D30, 18.3R1-S4, 18.3R2, 18.4R1, and all subsequent releases.

This issue is being tracked as PR 1337304 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
 

Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/ .
 

Workaround

This issue can be prevented by disabling the BGP graceful restart mechanism, including graceful restart helper mode:

[protocols bgp graceful-restart disable]

Furthermore, the risk associated with this issue can be mitigated by limiting BGP sessions only from trusted peers.
 

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History

  • ​2019-07-10: Initial Publication

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