Description

An Improper Handling of Exceptional Conditions vulnerability in the broadband edge subscriber management daemon (bbe-smgd) of Juniper Networks Junos OS on MX Series allows an attacker directly connected to the vulnerable system who repeatedly flaps DHCP subscriber sessions to cause a slow memory leak, ultimately leading to a Denial of Service (DoS). Memory can only be recovered by manually restarting bbe-smgd. This issue only occurs if BFD liveness detection for DHCP subscribers is enabled. Systems without BFD liveness detection enabled are not vulnerable to this issue. Indication of the issue can be observed by periodically executing the 'show system processes extensive' command, which will indicate an increase in memory allocation for bbe-smgd. A small amount of memory is leaked every time a DHCP subscriber logs in, which will become visible over time, ultimately leading to memory starvation. user@junos> show system processes extensive | match bbe-smgd 13071 root 24 0 415M 201M select 0 0:41 7.28% bbe-smgd{bbe-smgd} 13071 root 20 0 415M 201M select 1 0:04 0.00% bbe-smgd{bbe-smgd} ... user@junos> show system processes extensive | match bbe-smgd 13071 root 20 0 420M 208M select 0 4:33 0.10% bbe-smgd{bbe-smgd} 13071 root 20 0 420M 208M select 0 0:12 0.00% bbe-smgd{bbe-smgd} ... This issue affects Juniper Networks Junos OS on MX Series: * All versions earlier than 20.4R3-S9; * 21.2 versions earlier than 21.2R3-S7; * 21.3 versions earlier than 21.3R3-S5; * 21.4 versions earlier than 21.4R3-S5; * 22.1 versions earlier than 22.1R3-S4; * 22.2 versions earlier than 22.2R3-S3; * 22.3 versions earlier than 22.3R3-S2; * 22.4 versions earlier than 22.4R2-S2, 22.4R3; * 23.2 versions earlier than 23.2R1-S1, 23.2R2.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

CNA:  Juniper Networks, Inc.

Base Score:  6.5 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://supportportal.juniper.net/JSA75725	Vendor Advisory
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-755	Improper Handling of Exceptional Conditions	NIST   Juniper Networks, Inc.

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Change History

3 change records found show changes

CVE Modified by Juniper Networks, Inc. 5/14/2024 10:54:58 AM

Action	Type	Old Value	New Value

Initial Analysis by NIST 1/19/2024 12:44:35 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 6093 characters. View Entire Change Record AND OR *cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:* *cpe:2.3:o:juniper:junos:20
Added	CVSS V3.1		NIST AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-755
Changed	Reference Type	https://supportportal.juniper.net/JSA75725 No Types Assigned	https://supportportal.juniper.net/JSA75725 Vendor Advisory
Changed	Reference Type	https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L No Types Assigned	https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L Third Party Advisory

New CVE Received by NIST 1/11/2024 8:15:46 PM

Action	Type	Old Value	New Value
Added	CVSS V3.1		Juniper Networks, Inc. AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE		Juniper Networks, Inc. CWE-755
Added	Description		Record truncated, showing 500 of 1772 characters. View Entire Change Record An Improper Handling of Exceptional Conditions vulnerability in the broadband edge subscriber management daemon (bbe-smgd) of Juniper Networks Junos OS on MX Series allows an attacker directly connected to the vulnerable system who repeatedly flaps DHCP subscriber sessions to cause a slow memory leak, ultimately leading to a Denial of Service (DoS). Memory can only be recovered by manually restarting bbe-smgd. This issue only occurs if BFD liveness detection for DHCP subscribers is enabled. Sy
Added	Reference		Juniper Networks, Inc. https://supportportal.juniper.net/JSA75725 [No types assigned]
Added	Reference		Juniper Networks, Inc. https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L [No types assigned]