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Product Affected

This issue affects all versions of Junos OS. This issue affects all versions of Junos OS Evolved.

Severity

Medium

Severity Assessment (CVSS) Score

CVSS: v3.1: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS: v4.0: 7.1 (CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/R:A)

Problem

An Improper Control of a Resource Through its Lifetime vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).

On devices with SRv6 (Segment Routing over IPv6) enabled, an attacker can send a malformed BGP UPDATE packet which will cause the rpd to crash and restart. Continued receipt of these UPDATE packets will cause a sustained DoS condition.

This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.

The configuration required to hit the issue or be potentially exploited is as follows:

[ protocols bgp source-packet-routing srv6 locator ]

This issue affects:
Junos OS:

All versions before 21.2R3-S9,
from 21.4 before 21.4R3-S10,
from 22.2 before 22.2R3-S5,
from 22.3 before 22.3R3-S4,
from 22.4 before 22.4R3-S3,
from 23.2 before 23.2R2-S2,
from 23.4 before 23.4R2;

Junos OS Evolved:

All versions before 21.2R3-S9-EVO,
from 21.4-EVO before 21.4R3-S10-EVO,
from 22.2-EVO before 22.2R3-S5-EVO,
from 22.3-EVO before 22.3R3-S4-EVO,
from 22.4-EVO before 22.4R3-S3-EVO,
from 23.2-EVO before 23.2R2-S2-EVO,
from 23.4-EVO before 23.4R2-EVO.

Solution

The following software releases have been updated to resolve this specific issue:
Junos OS: 21.2R3-S9, 21.4R3-S10, 22.2R3-S5, 22.3R3-S4, 22.4R3-S3, 23.2R2-S2, 23.4R2, 24.2R1, and all subsequent releases.
Junos OS Evolved: 21.2R3-S9-EVO, 21.4R3-S10-EVO, 22.2R3-S5-EVO, 22.3R3-S4-EVO, 22.4R3-S3-EVO, 23.2R2-S2-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.

This issue is being tracked as 1806694 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).

Workaround

There are no known workarounds for this issue.

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