Article Detail

Product Affected

This issue affects all versions of Junos OS. Affected platforms: QFX5000 Series, EX4600 Series.

Severity

Medium

Severity Assessment (CVSS) Score

CVSS 3.1: 5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)

CVSS 4.0: 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N)

Problem

An Unimplemented or Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an unauthenticated, network-based attacker to cause a minor integrity impact to downstream networks.

If one or more of the following match conditions

ip-source-address
ip-destination-address
arp-type

which are not supported for this type of filter, are used in an ethernet switching filter, and then this filter is applied as an output filter, the configuration can be committed but the filter will not be in effect.

This issue affects Junos OS on QFX5000 Series and EX4600 Series:

All version before 21.2R3-S7,
21.4 versions before 21.4R3-S6,
22.1 versions before 22.1R3-S5,
22.2 versions before 22.2R3-S3,
22.3 versions before 22.3R3-S2,
22.4 versions before 22.4R3,
23.2 versions before 23.2R2.

Please note that the implemented fix ensures these unsupported match conditions cannot be committed anymore.

The following shows an example of such an affected filter:

[ firewall family ethernet-switching filter <filter> term <term> from ip-source-address ... ] [ interfaces <interface> unit <unit> family ethernet-switching filter output <filter> ]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

Solution

The following software releases have been updated to resolve this specific issue: 21.2R3-S7, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, 22.4R3, 23.2R2, 23.4R1, and all subsequent releases.

This issue is being tracked as 1761884 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