CVE-2023-28981

Junos OS and Junos OS Evolved: If malformed IPv6 router advertisements are received, memory corruption will occur which causes an rpd crash

Description

An Improper Input Validation vulnerability in the kernel of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). If the receipt of router advertisements is enabled on an interface and a specifically malformed RA packet is received, memory corruption will happen which leads to an rpd crash. This issue affects: Juniper Networks Junos OS 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R2; 22.1 versions prior to 22.1R2. Juniper Networks Junos OS Evolved 20.3-EVO version 20.3R1-EVO and later versions; 20.4-EVO versions prior to 20.4R3-S6-EVO; 21.3-EVO versions prior to 21.3R3-EVO; 21.4-EVO versions prior to 21.4R2-EVO; 22.1-EVO versions prior to 22.1R2-EVO.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 20.4R3-S6-EVO, 21.3R3-EVO, 21.4R2-EVO, 22.1R2-EVO, 22.2R1-EVO, and all subsequent releases. Junos OS: 20.3R3-S5, 20.4R3-S3, 21.1R3-S4, 21.2R3, 21.3R3, 21.4R2, 22.1R2, 22.2R1, and all subsequent releases.

Workaround:

  • If the receipt of router advertisements is not necessary (but just the solicited or unsolicited sending of RAs) then incoming RAs can be filtered and dropped by applying a firewall filter like the following: set firewall family inet6 filter test term 1 from next-header icmp6 set firewall family inet6 filter test term 1 from icmp-type 134 set firewall family inet6 filter test term 1 then discard set firewall family inet6 filter test term 2 then accept

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.06%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Affected: Juniper Networks Junos OS Evolved
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA70607 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2023-28981?
CVE-2023-28981 has been scored as a medium severity vulnerability.
How to fix CVE-2023-28981?
To fix CVE-2023-28981: The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 20.4R3-S6-EVO, 21.3R3-EVO, 21.4R2-EVO, 22.1R2-EVO, 22.2R1-EVO, and all subsequent releases. Junos OS: 20.3R3-S5, 20.4R3-S3, 21.1R3-S4, 21.2R3, 21.3R3, 21.4R2, 22.1R2, 22.2R1, and all subsequent releases.
Is CVE-2023-28981 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-28981 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-28981?
CVE-2023-28981 affects Juniper Networks Junos OS, Juniper Networks Junos OS Evolved.
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