National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2020-9054 Detail

Current Description

Multiple ZyXEL network-attached storage (NAS) devices running firmware version 5.21 contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable device. ZyXEL NAS devices achieve authentication by using the weblogin.cgi CGI executable. This program fails to properly sanitize the username parameter that is passed to it. If the username parameter contains certain characters, it can allow command injection with the privileges of the web server that runs on the ZyXEL device. Although the web server does not run as the root user, ZyXEL devices include a setuid utility that can be leveraged to run any command with root privileges. As such, it should be assumed that exploitation of this vulnerability can lead to remote code execution with root privileges. By sending a specially-crafted HTTP POST or GET request to a vulnerable ZyXEL device, a remote, unauthenticated attacker may be able to execute arbitrary code on the device. This may happen by directly connecting to a device if it is directly exposed to an attacker. However, there are ways to trigger such crafted requests even if an attacker does not have direct connectivity to a vulnerable devices. For example, simply visiting a website can result in the compromise of any ZyXEL device that is reachable from the client system. Affected products include: NAS326 before firmware V5.21(AAZF.7)C0 NAS520 before firmware V5.21(AASZ.3)C0 NAS540 before firmware V5.21(AATB.4)C0 NAS542 before firmware V5.21(ABAG.4)C0 ZyXEL has made firmware updates available for NAS326, NAS520, NAS540, and NAS542 devices. Affected models that are end-of-support: NSA210, NSA220, NSA220+, NSA221, NSA310, NSA310S, NSA320, NSA320S, NSA325 and NSA325v2

Source:  MITRE
View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score: 9.8 CRITICAL
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://cwe.mitre.org/data/definitions/78.html Third Party Advisory
https://kb.cert.org/vuls/id/498544/ Third Party Advisory US Government Resource
https://krebsonsecurity.com/2020/02/zyxel-fixes-0day-in-network-storage-devices/ Exploit Third Party Advisory
https://www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml Vendor Advisory

Weakness Enumeration

CWE-ID CWE Name Source
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') NIST   CERT/CC  

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
5.21\(aazf.7\)c0
Running on/with
 cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 2 ( hide )
 cpe:2.3:o:zyxel:nas520_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
5.21\(aasz.3\)c0
Running on/with
 cpe:2.3:h:zyxel:nas520:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 3 ( hide )
 cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
5.21\(aatb.4\)c0
Running on/with
 cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 4 ( hide )
 cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
5.21\(abag.4\)c0
Running on/with
 cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 5 ( hide )
 cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abps.3\)c0
Running on/with
 cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 6 ( hide )
 cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abfw.3\)c0
Running on/with
 cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 7 ( hide )
 cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abfu.3\)c0
Running on/with
 cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 8 ( hide )
 cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abiq.3\)c0
Running on/with
 cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 9 ( hide )
 cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abaq.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 10 ( hide )
 cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abar.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 11 ( hide )
 cpe:2.3:o:zyxel:usg40_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aala.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 12 ( hide )
 cpe:2.3:o:zyxel:usg40w_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aalb.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 13 ( hide )
 cpe:2.3:o:zyxel:usg60_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aaky.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 14 ( hide )
 cpe:2.3:o:zyxel:usg60w_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aakz.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 15 ( hide )
 cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aaph.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 16 ( hide )
 cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aapi.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 17 ( hide )
 cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aapj.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 18 ( hide )
 cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aapk.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 19 ( hide )
 cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aapl.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 20 ( hide )
 cpe:2.3:o:zyxel:usg2200_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abae.3\)c0
Running on/with
 cpe:2.3:h:zyxel:usg2200:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 21 ( hide )
 cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abhl.3\)c0
Running on/with
 cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 22 ( hide )
 cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abfv.3\)c0
Running on/with
 cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 23 ( hide )
 cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abfc.3\)c0
Running on/with
 cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 24 ( hide )
 cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(abip.3\)c0
Running on/with
 cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 25 ( hide )
 cpe:2.3:o:zyxel:zywall110_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aaaa.3\)c0
Running on/with
 cpe:2.3:h:zyxel:zywall110:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 26 ( hide )
 cpe:2.3:o:zyxel:zywall310_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aaab.3\)c0
Running on/with
 cpe:2.3:h:zyxel:zywall310:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 27 ( hide )
 cpe:2.3:o:zyxel:zywall1100_firmware:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
4.35
Up to (excluding)
4.35\(aaac.3\)c0
Running on/with
 cpe:2.3:h:zyxel:zywall1100:-:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

1 change record found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-9054
NVD Published Date:
03/04/2020
NVD Last Modified:
03/06/2020