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2020-07 Security Bulletin: Junos OS and Junos OS Evolved: RPD crash while processing a specific BGP update information. (CVE-2020-1646)

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Article ID: JSA11033 SECURITY_ADVISORIES Last Updated: 08 Jul 2020Version: 1.0
Product Affected:
This issue affects Junos OS 17.3, 17.4, 18.1. This issue affects Junos OS Evolved 19.2-EVO.
Problem:

On Juniper Networks Junos OS and Junos OS Evolved devices, processing a specific UPDATE for an EBGP peer can lead to a routing process daemon (RPD) crash and restart.

This issue occurs only when the device is receiving and processing the BGP UPDATE for an EBGP peer.

This issue does not occur when the device is receiving and processing the BGP UPDATE for an IBGP peer.

However, the offending BGP UPDATE can originally come from an EBGP peer, propagates through the network via IBGP peers without causing crash, then it causes RPD crash when it is processed for a BGP UPDATE towards an EBGP peer.

Repeated receipt and processing of the same specific BGP UPDATE can result in an extended Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS: 17.3R3-S6, 17.4R2-S7, and 18.1R3-S7.

Juniper Networks Junos OS Evolved 19.2R2-EVO and later versions, prior to 19.3R1-EVO.

Other Junos OS releases 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-2020-1646.

Solution:

The following software releases have been updated to resolve this specific issue:

Junos OS: 17.3R3-S7, 17.4R2-S8, 18.1R3-S8, and all subsequent releases.

This fix has been proactively committed to other Junos OS releases that are not vulnerable to this issue.

Junos OS Evolved: 19.3R1-EVO and all subsequent releases.

This issue is being tracked as 1448425.

Workaround:

There are no available workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
Modification History:
‚Äč2020-07-08: Initial publication
CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
High
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."

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