Vulnerability Details CVE-2020-29583
Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password. The password for this account can be found in cleartext in the firmware. This account can be used by someone to login to the ssh server or web interface with admin privileges.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.943
EPSS Ranking 99.9%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 10.0
Proposed Action
Zyxel firewalls (ATP, USG, VM) and AP Controllers (NXC2500 and NXC5500) contain a use of hard-coded credentials vulnerability in an undocumented account ("zyfwp") with an unchangeable password.
Ransomware Campaign
Unknown
References
- http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf
- https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release
- https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15
- https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html
- https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/
- https://www.zyxel.com/support/CVE-2020-29583.shtml
- https://www.zyxel.com/support/security_advisories.shtml
- http://ftp.zyxel.com/USG40/firmware/USG40_4.60%28AALA.1%29C0_2.pdf
- https://businessforum.zyxel.com/discussion/5252/zld-v4-60-revoke-and-wk48-firmware-release
- https://businessforum.zyxel.com/discussion/5254/whats-new-for-zld4-60-patch-1-available-on-dec-15
- https://www.eyecontrol.nl/blog/undocumented-user-account-in-zyxel-products.html
- https://www.secpod.com/blog/a-secret-zyxel-firewall-and-ap-controllers-could-allow-for-administrative-access-cve-2020-29583/
- https://www.zyxel.com/support/CVE-2020-29583.shtml
- https://www.zyxel.com/support/security_advisories.shtml
Products affected by CVE-2020-29583
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cpe:2.3:h:zyxel:atp100:-
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cpe:2.3:h:zyxel:atp100w:-
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cpe:2.3:h:zyxel:atp200:-
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cpe:2.3:h:zyxel:atp500:-
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cpe:2.3:h:zyxel:atp700:-
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cpe:2.3:h:zyxel:atp800:-
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cpe:2.3:h:zyxel:usg1100:-
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cpe:2.3:h:zyxel:usg110:-
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cpe:2.3:h:zyxel:usg1900:-
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cpe:2.3:h:zyxel:usg20-vpn:-
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cpe:2.3:h:zyxel:usg20w-vpn:-
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cpe:2.3:h:zyxel:usg210:-
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cpe:2.3:h:zyxel:usg2200:-
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cpe:2.3:h:zyxel:usg310:-
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cpe:2.3:h:zyxel:usg40:-
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cpe:2.3:h:zyxel:usg40w:-
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cpe:2.3:h:zyxel:usg60:-
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cpe:2.3:h:zyxel:usg60w:-
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cpe:2.3:h:zyxel:usg_flex_100:-
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cpe:2.3:h:zyxel:usg_flex_100w:-
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cpe:2.3:h:zyxel:usg_flex_200:-
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cpe:2.3:h:zyxel:usg_flex_500:-
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cpe:2.3:h:zyxel:usg_flex_700:-
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cpe:2.3:h:zyxel:vpn1000:-
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cpe:2.3:h:zyxel:vpn100:-
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cpe:2.3:h:zyxel:vpn300:-
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cpe:2.3:h:zyxel:vpn50:-
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cpe:2.3:h:zyxel:zywall1100:-
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cpe:2.3:h:zyxel:zywall110:-
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cpe:2.3:h:zyxel:zywall310:-
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cpe:2.3:o:zyxel:atp100_firmware:4.60
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cpe:2.3:o:zyxel:atp100w_firmware:4.60
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cpe:2.3:o:zyxel:atp200_firmware:4.60
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cpe:2.3:o:zyxel:atp500_firmware:4.60
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cpe:2.3:o:zyxel:atp700_firmware:4.60
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cpe:2.3:o:zyxel:atp800_firmware:4.60
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cpe:2.3:o:zyxel:usg1100_firmware:4.60
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cpe:2.3:o:zyxel:usg110_firmware:4.60
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cpe:2.3:o:zyxel:usg1900_firmware:4.60
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cpe:2.3:o:zyxel:usg20-vpn_firmware:4.60
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cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.60
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cpe:2.3:o:zyxel:usg210_firmware:4.60
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cpe:2.3:o:zyxel:usg2200_firmware:4.60
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cpe:2.3:o:zyxel:usg310_firmware:4.60
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cpe:2.3:o:zyxel:usg40_firmware:4.60
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cpe:2.3:o:zyxel:usg40w_firmware:4.60
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cpe:2.3:o:zyxel:usg60_firmware:4.60
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cpe:2.3:o:zyxel:usg60w_firmware:4.60
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cpe:2.3:o:zyxel:usg_flex_100_firmware:4.60
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cpe:2.3:o:zyxel:usg_flex_100w_firmware:4.60
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cpe:2.3:o:zyxel:usg_flex_200_firmware:4.60
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cpe:2.3:o:zyxel:usg_flex_500_firmware:4.60
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cpe:2.3:o:zyxel:usg_flex_700_firmware:4.60
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cpe:2.3:o:zyxel:vpn1000_firmware:4.60
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cpe:2.3:o:zyxel:vpn100_firmware:4.60
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cpe:2.3:o:zyxel:vpn300_firmware:4.60
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cpe:2.3:o:zyxel:vpn50_firmware:4.60
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cpe:2.3:o:zyxel:zywall1100_firmware:4.60
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cpe:2.3:o:zyxel:zywall110_firmware:4.60
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cpe:2.3:o:zyxel:zywall310_firmware:4.60