High severity · published Nov 14, 2019
CVE-2019-15804
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0
7.5
CVSS
0.9%
EPSS
No
On KEV
Description
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains "Password recovery for specific user" options. The menu is believed to be accessible using a serial console.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GF
Gs1900-10hp Firmware · Zyxel
before 2.50\(aazi.0\)c0 · source: NVD
GF
Gs1900-16 Firmware · Zyxel
before 2.50\(aahj.0\)c0 · source: NVD
GF
Gs1900-24 Firmware · Zyxel
before 2.50\(aahl.0\)c0 · source: NVD
GF
Gs1900-24e Firmware · Zyxel
before 2.50\(aahk.0\)c0 · source: NVD
GF
Gs1900-24hp Firmware · Zyxel
before 2.50\(aahm.0\)c0 · source: NVD
GF
Gs1900-48 Firmware · Zyxel
before 2.50\(aahn.0\)c0 · source: NVD
GF
Gs1900-48hp Firmware · Zyxel
before 2.50\(aaho.0\)c0 · source: NVD
GF
Gs1900-8 Firmware · Zyxel
before 2.50\(aahh.0\)c0 · source: NVD
GF
Gs1900-8hp Firmware · Zyxel
before 2.50\(aahi.0\)c0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-15804
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-15804
Exploit
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html
Vendor Advisory
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml
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