CVE-2020-9054
Zyxel Multiple NAS Devices OS Command Injection Vu - [Actively Exploited]
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
INFO
Published Date :
March 4, 2020, 8:15 p.m.
Last Modified :
March 6, 2020, 5:58 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code.
Apply updates per vendor instructions.
Public PoC/Exploit Available at Github
CVE-2020-9054 has a 10 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2020-9054
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-9054.
| URL | Resource |
|---|---|
| https://cwe.mitre.org/data/definitions/78.html | Third Party Advisory |
| https://kb.cert.org/artifacts/cve-2020-9054.html | Third Party Advisory US Government Resource |
| 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
CSS HTML JavaScript
在公网收集的gobypoc+部分自己加的poc
None
Python
None
Scan log files for suspicious strings
TypeScript JavaScript Batchfile Shell
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
CVE-2020-9054 PoC for Zyxel
Python
None
Python XSLT
Automatic monitor github cve using Github Actions
Python
essential templates for kenzer [DEPRECATED]
kenzer vulnerabilities kenzer-templates arpsyndicate
Python Shell Ruby
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-9054 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-9054 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Mar. 06, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://cwe.mitre.org/data/definitions/78.html No Types Assigned https://cwe.mitre.org/data/definitions/78.html Third Party Advisory Changed Reference Type https://kb.cert.org/artifacts/cve-2020-9054.html No Types Assigned https://kb.cert.org/artifacts/cve-2020-9054.html Third Party Advisory, US Government Resource Changed Reference Type https://kb.cert.org/vuls/id/498544/ No Types Assigned https://kb.cert.org/vuls/id/498544/ Third Party Advisory, US Government Resource Changed Reference Type https://krebsonsecurity.com/2020/02/zyxel-fixes-0day-in-network-storage-devices/ No Types Assigned https://krebsonsecurity.com/2020/02/zyxel-fixes-0day-in-network-storage-devices/ Exploit, Third Party Advisory Changed Reference Type https://www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml No Types Assigned https://www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml Vendor Advisory Added CWE NIST CWE-78 Added CPE Configuration AND OR *cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.21\(aazf.7\)c0 OR cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:nas520_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.21\(aasz.3\)c0 OR cpe:2.3:h:zyxel:nas520:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.21\(aatb.4\)c0 OR cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.21\(abag.4\)c0 OR cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abps.3\)c0 OR cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abfw.3\)c0 OR cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abfu.3\)c0 OR cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abiq.3\)c0 OR cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abaq.3\)c0 OR cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abar.3\)c0 OR cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg40_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aala.3\)c0 OR cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg40w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aalb.3\)c0 OR cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg60_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aaky.3\)c0 OR cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg60w_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aakz.3\)c0 OR cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aaph.3\)c0 OR cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aapi.3\)c0 OR cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aapj.3\)c0 OR cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aapk.3\)c0 OR cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aapl.3\)c0 OR cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:usg2200_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abae.3\)c0 OR cpe:2.3:h:zyxel:usg2200:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abhl.3\)c0 OR cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abfv.3\)c0 OR cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abfc.3\)c0 OR cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(abip.3\)c0 OR cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall110_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aaaa.3\)c0 OR cpe:2.3:h:zyxel:zywall110:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall310_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aaab.3\)c0 OR cpe:2.3:h:zyxel:zywall310:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:zyxel:zywall1100_firmware:*:*:*:*:*:*:*:* versions from (including) 4.35 up to (excluding) 4.35\(aaac.3\)c0 OR cpe:2.3:h:zyxel:zywall1100:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-9054 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-9054
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
96.99 }} 0.01%
score
0.99777
percentile