CVE-2020-13365

Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0.

CVSS v3 8.8 HIGH
CVSS v2.0 9.0 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

9.0^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:S/C:C/I:C/A:C

Exploitability : 8.0 / Impact : 10.0

Access Vector NETWORK

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml	Vendor Advisory
https://www.zyxel.com/us/en/support/security_advisories.shtml	Vendor Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:zyxel:nas520_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:nas520:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND

cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND

cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2020-08-06 17:15

Updated : 2024-02-28 17:47

NVD link : CVE-2020-13365

Mitre link : CVE-2020-13365

CVE.ORG link : CVE-2020-13365

JSON object : View

Products Affected

zyxel

nas542
nas326_firmware
nas540_firmware
nas326
nas520_firmware
nas542_firmware
nas540
nas520

CWE

CWE-287

Improper Authentication

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This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0."}, {"lang": "es", "value": "Determinados productos Zyxel tienen un binario accesible localmente que permite a un usuario no root generar una contrase\u00f1a para una cuenta de usuario no documentada que puede ser usada para una sesi\u00f3n de TELNET como root. Esto afecta a NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, y V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, y V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 y V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 y 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, y V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 y V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; y NAS540 V5.21(AATB.5)C0 y V5.21(AATB.3)C0"}], "lastModified": "2022-02-09T16:51:42.270", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B045EF5D-B584-4DAA-B0EF-149310C61AC1", "versionEndExcluding": "v5.21\\(aazf.9\\)c0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "E0A01B19-4A91-4FBC-8447-2E854346DAC5"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zyxel:nas520_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D88E8EAE-2492-421F-A904-CE167C0C6B61", "versionEndExcluding": "v5.21\\(aasz.5\\)c0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:zyxel:nas520:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "07B2BA3D-40F0-4D59-8838-B226FAABF27E"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8D4A8264-3806-47C1-BDCB-04C569BC74CD", "versionEndExcluding": "v5.21\\(aatb.6\\)c0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "B2F7264C-D32A-4EE9-BADC-78518D762BCA"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "23F5B87E-5526-4CDD-8F96-D78C00B7B490", "versionEndExcluding": "v5.21\\(abag.6\\)c0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "31C4DD0F-28D0-4BF7-897B-5EEC32AA7277"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}