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    CVE-2019-15803

    An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fds_sys_passDebugPasswd_ret(). The firmware contains access control checks that determine if remote users are allowed to access this functionality. The function that performs this check (fds_sys_remoteDebugEnable_ret in libfds.so) always return TRUE with no actual checks performed. The diagnostics menu allows for reading/writing arbitrary registers and various other configuration parameters which are believed to be related to the network interface chips.

    Published:Nov 14, 2019
    Last Modified:Nov 21, 2024
    EPS:Nov 14, 2019
    EPSS Score:0.00376
    CVSS Score:9.1

    Affected Products

    Vendor
    Zyxel
    Product
    Gs1900-10hp
    Vendor
    Zyxel
    Product
    Gs1900-10hp Firmware
    Vendor
    Zyxel
    Product
    Gs1900-16
    Vendor
    Zyxel
    Product
    Gs1900-16 Firmware
    Vendor
    Zyxel
    Product
    Gs1900-24
    Vendor
    Zyxel
    Product
    Gs1900-24 Firmware
    Vendor
    Zyxel
    Product
    Gs1900-24e
    Vendor
    Zyxel
    Product
    Gs1900-24e Firmware
    Vendor
    Zyxel
    Product
    Gs1900-24hp
    Vendor
    Zyxel
    Product
    Gs1900-24hp Firmware
    Vendor
    Zyxel
    Product
    Gs1900-48
    Vendor
    Zyxel
    Product
    Gs1900-48 Firmware
    Vendor
    Zyxel
    Product
    Gs1900-48hp
    Vendor
    Zyxel
    Product
    Gs1900-48hp Firmware
    Vendor
    Zyxel
    Product
    Gs1900-8
    Vendor
    Zyxel
    Product
    Gs1900-8 Firmware
    Vendor
    Zyxel
    Product
    Gs1900-8hp
    Vendor
    Zyxel
    Product
    Gs1900-8hp Firmware

    Exploits

    https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlhttps://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2024-8882 (CVSS 4.5) — A buffer overflow vulnerability in the CGI program in the Zyxel GS1900-48 switch firmware version V2.80(AAHN.1…
    CVE-2024-8881 (CVSS 6.8) — A post-authentication command injection vulnerability in the CGI program in the Zyxel GS1900-48 switch firmwar…
    CVE-2024-38270 (CVSS 5.3) — An insufficient entropy vulnerability caused by the improper use of a randomness function with low entropy for…
    CVE-2023-35140 (CVSS 5.5) — The improper privilege management vulnerability in the Zyxel GS1900-24EP switch firmware version V2.70(ABTO.5)…
    CVE-2022-45853 (CVSS 6.7) — The privilege escalation vulnerability in the Zyxel GS1900-8 firmware version V2.70(AAHH.3) and the GS1900-8…
    CVE-2022-34746 (CVSS 5.9) — An insufficient entropy vulnerability caused by the improper use of randomness sources with low entropy for RS…
    CVE-2021-35032 (CVSS 6.4) — A vulnerability in the 'libsal.so' of the Zyxel GS1900 series firmware version 2.60 could allow an authenticat…
    CVE-2021-35031 (CVSS 6.8) — A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 serie…
    CVE-2021-35030 (CVSS 3.5) — A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly s…
    CVE-2019-15799 (CVSS 8.8) — An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created thr…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High