2023-10 Security Bulletin: Junos OS Evolved: PTX10003 Series: Packets which are not destined to the router can reach the RE (CVE-2023-44196)

Product Affected

This issue affects all versions of Junos OS Evolved. Affected platforms: PTX10003 Series.

Severity

Medium

Severity Assessment (CVSS) Score

6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

Problem

An Improper Check for Unusual or Exceptional Conditions in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS Evolved on PTX10003 Series allows an unauthenticated adjacent attacker to cause an impact to the integrity of the system.

When specific transit MPLS packets are received by the PFE, these packets are internally forwarded to the RE. This issue is a prerequisite for CVE-2023-44195.

This issue affects Juniper Networks Junos OS Evolved:

All versions prior to 20.4R3-S8-EVO;
21.1-EVO version 21.1R1-EVO and later;
21.2-EVO versions prior to 21.2R3-S6-EVO;
21.3-EVO version 21.3R1-EVO and later;
21.4-EVO versions prior to 21.4R3-S3-EVO;
22.1-EVO versions prior to 22.1R3-S4-EVO;
22.2-EVO versions prior to 22.2R3-S3-EVO;
22.3-EVO versions prior to 22.3R2-S2-EVO, 22.3R3-EVO;
22.4-EVO versions prior to 22.4R2-EVO.

To be affected by this vulnerability the device needs to be configured with MPLS like in the following example:

[interfaces <interface> unit <unit#> family mpls]

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-2023-44196.

Solution

The following software releases have been updated to resolve this specific issue: 20.4R3-S8-EVO, 21.2R3-S6-EVO, 21.4R3-S3-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R2-S2-EVO, 22.3R3-EVO, 22.4R2-EVO, 23.2R1-EVO, and all subsequent releases.

This issue is being tracked as PR 1705997 which is visible on the Customer Support website.

Note: Juniper SIRT's policy [juniper.net] 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