Juniper Junos telnetd.real unnecessary privileges

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CVSS Meta Temp Score
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7.5$0-$5k0.09

A vulnerability was found in Juniper Junos (Router Operating System) (the affected version is unknown). It has been declared as critical. This vulnerability affects an unknown code of the file telnetd.real. The manipulation with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-250. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A local privilege escalation vulnerability in telnetd.real of Juniper Networks Junos OS may allow a locally authenticated shell user to escalate privileges and execute arbitrary commands as root. telnetd.real is shipped with setuid permissions enabled and is owned by the root user, allowing local users to run telnetd.real with root privileges. This issue affects Juniper Networks Junos OS: all versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S12, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R2-S4, 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R2.

The weakness was released 01/16/2021 as JSA11114. The advisory is available at kb.juniper.net. This vulnerability was named CVE-2021-0223 since 10/27/2020. The exploitation appears to be easy. Local access is required to approach this attack. A single authentication is needed for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 02/15/2021). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading eliminates this vulnerability.

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VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-250
ATT&CK: T1068

Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat: 🔍
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Recommended: Upgrade
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0-Day Time: 🔒

Timelineinfoedit

10/27/2020 CVE assigned
01/16/2021 +81 days Advisory disclosed
01/16/2021 +0 days VulDB entry created
02/15/2021 +30 days VulDB last update

Sourcesinfoedit

Vendor: https://www.juniper.net/

Advisory: JSA11114
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-0223 (🔒)

Entryinfoedit

Created: 01/16/2021 09:18 AM
Updated: 02/15/2021 01:12 AM
Changes: (8) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai source_cve_cna vulnerability_cvss2_nvd_basescore
Complete: 🔍

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