High severity · published Nov 14, 2019
CVE-2019-15801
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0
7.5
CVSS
1.5%
EPSS
No
On KEV
Description
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% 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-2019-15801
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-15801
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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