2021-0293 | Juniper Junos OS/Junos OS Evolved CLI memory leak (JSA11195)

CVSS Meta Temp Score	Current Exploit Price (≈)	CTI Interest Score
4.1	$0-$5k	1.05

A vulnerability was found in Juniper Junos OS and Junos OS Evolved (Router Operating System) (unknown version) and classified as problematic. This issue affects an unknown part of the component CLI. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-401. Impacted is availability. The summary by CVE is:

A vulnerability in Juniper Networks Junos OS caused by Missing Release of Memory after Effective Lifetime leads to a memory leak each time the CLI command ‘show system connections extensive’ is executed. The amount of memory leaked on each execution depends on the number of TCP connections from and to the system. Repeated execution will cause more memory to leak and eventually daemons that need to allocate additionally memory and ultimately the kernel to crash, which will result in traffic loss. Continued execution of this command will cause a sustained Denial of Service (DoS) condition. An administrator can use the following CLI command to monitor for increase in memory consumption of the netstat process, if it exists: [email protected]> show system processes extensive | match “username|netstat” PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 21181 root 100 0 5458M 4913M CPU3 2 0:59 97.27% netstat The following log message might be observed if this issue happens: kernel: %KERN-3: pid 21181 (netstat), uid 0, was killed: out of swap space This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R2-S8, 18.2R3-S7. 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R1-S4, 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2; This issue does not affect Juniper Networks Junos OS versions prior to 18.2R1.

The weakness was disclosed 07/16/2021 as JSA11195. It is possible to read the advisory at kb.juniper.net. The identification of this vulnerability is CVE-2021-0293 since 10/27/2020. The exploitation is known to be easy. The attack may be initiated remotely. A simple authentication is necessary for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/19/2021). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

Type

Vendor

Name

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Denial of service
CWE: CWE-401
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: kb.juniper.net

10/27/2020 CVE assigned
07/16/2021 +261 days Advisory disclosed
07/16/2021 +0 days VulDB entry created
07/19/2021 +3 days VulDB last updateVendor: https://www.juniper.net/

Advisory: JSA11195
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-0293 (🔒)

Created: 07/16/2021 08:07
Updated: 07/19/2021 03:27
Changes: (1) source_cve_cna
Complete: 🔍

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