title: Junos OS: An rpd core will occur if BGP update tracing is configured and an update containing a malformed BGP SR-TE policy tunnel attribute is received
description: An Improper Validation of Specified Quantity in Input vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS allows an unauthenticated networked attacker to cause an rdp crash and thereby a Denial of Service (DoS). If a BGP update message is received over an established BGP session where a BGP SR-TE policy tunnel attribute is malformed and BGP update tracing flag is enabled, the rpd will core. This issue can happen with any BGP session as long as the previous conditions are met. This issue can not propagate as the crash occurs as soon as the malformed update is received. This issue affects Juniper Networks Junos OS: 20.4 versions prior to 20.4R3-S1; 21.1 versions prior to 21.1R2-S2, 21.1R3. This issue does not affect Juniper Networks Junos OS versions prior to 20.4R1.
problem types: CWE-1284 Improper Validation of Specified Quantity in Input
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R1, status: unaffected, version: unspecified, versionType: custom
lessThan: 20.4R3-S1, status: affected, version: 20.4, versionType: custom
lessThan: 21.1R2-S2, 21.1R3, status: affected, version: 21.1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue: 20.4R3-S1, 21.1R2-S2, 21.1R3, 21.2R1, and all subsequent releases.
workarounds: Please remove the BGP update trace configuration that's applicable.
[ protocols bgp ... traceoptions flag update ]