CVE-2020-9054
19h30 +00:00
Deskripsi CVE
ZyXEL NAS products running firmware version 5.21 and earlier are vulnerable to pre-authentication command injection in weblogin.cgi
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 NSA325v2Solusi CVE
Informasi CVE
Kelemahan Terkait
| Nama Kelemahan | Sumber | |
|---|---|---|
| Improper Neutralization of Special Elements used in an OS Command The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component. |
Metrik
| Metrik | Skor | Tingkat keparahan | CVSS Vektor | Sumber |
|---|---|---|---|---|
| V3.1 | 9.8 | CRITICAL |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Informasi lebih lanjut
Base: Exploitabilty MetricsThe Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. Network The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). Attack Complexity This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability. Low Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. None The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component. None The vulnerable system can be exploited without interaction from any user. Base: Scope MetricsThe Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope. Scope Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs. Unchanged An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority. Base: Impact MetricsThe Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. High There is a total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. High There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. High There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable). Temporal MetricsThe Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability. Environmental MetricsThese metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability. |
nvd@nist.gov |
| V2 | 10 | AV:N/AC:L/Au:N/C:C/I:C/A:C | nvd@nist.gov |
CISA KEV (Kerentanan yang Diketahui Dieksploitasi)
Nama kerentanan : Zyxel Multiple NAS Devices OS Command Injection Vulnerability
Tindakan yang diperlukan : Apply updates per vendor instructions.
Diketahui Digunakan dalam Kampanye Ransomware : Unknown
Ditambahkan : 2022-03-25 00h00 +00:00
Tindakan jatuh tempo : 2022-04-15 00h00 +00:00
EPSS
Skor EPSS
Persentil EPSS
Produk yang Disebutkan
Konfigurasi 0
Zyxel>>Nas326_firmware >> Version Hingga (tidak termasuk) 5.21\(aazf.10\)c0
Zyxel>>Nas326 >> Version -
Konfigurasi 0
Zyxel>>Nas520_firmware >> Version Hingga (tidak termasuk) 5.21\(aasz.3\)c0
Zyxel>>Nas520 >> Version -
Konfigurasi 0
Zyxel>>Nas540_firmware >> Version Hingga (tidak termasuk) 5.21\(aatb.7\)c0
Zyxel>>Nas540 >> Version -
Konfigurasi 0
Zyxel>>Nas542_firmware >> Version Hingga (tidak termasuk) 5.21\(abag.7\)c0
Zyxel>>Nas542 >> Version -
Konfigurasi 0
Zyxel>>Atp100_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abps.3\)c0
Zyxel>>Atp100 >> Version -
Konfigurasi 0
Zyxel>>Atp200_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abfw.3\)c0
Zyxel>>Atp200 >> Version -
Konfigurasi 0
Zyxel>>Atp500_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abfu.3\)c0
Zyxel>>Atp500 >> Version -
Konfigurasi 0
Zyxel>>Atp800_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abiq.3\)c0
Zyxel>>Atp800 >> Version -
Konfigurasi 0
Zyxel>>Usg20-vpn_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abaq.3\)c0
Zyxel>>Usg20-vpn >> Version -
Konfigurasi 0
Zyxel>>Usg20w-vpn_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abar.3\)c0
Zyxel>>Usg20w-vpn >> Version -
Konfigurasi 0
Zyxel>>Usg40_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aala.3\)c0
Zyxel>>Usg40 >> Version -
Konfigurasi 0
Zyxel>>Usg40w_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aalb.3\)c0
Zyxel>>Usg40w >> Version -
Konfigurasi 0
Zyxel>>Usg60_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aaky.3\)c0
Zyxel>>Usg60 >> Version -
Konfigurasi 0
Zyxel>>Usg60w_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aakz.3\)c0
Zyxel>>Usg60w >> Version -
Konfigurasi 0
Zyxel>>Usg110_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aaph.3\)c0
Zyxel>>Usg110 >> Version -
Konfigurasi 0
Zyxel>>Usg210_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aapi.3\)c0
Zyxel>>Usg210 >> Version -
Konfigurasi 0
Zyxel>>Usg310_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aapj.3\)c0
Zyxel>>Usg310 >> Version -
Konfigurasi 0
Zyxel>>Usg1100_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aapk.3\)c0
Zyxel>>Usg1100 >> Version -
Konfigurasi 0
Zyxel>>Usg1900_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aapl.3\)c0
Zyxel>>Usg1900 >> Version -
Konfigurasi 0
Zyxel>>Usg2200_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abae.3\)c0
Zyxel>>Usg2200 >> Version -
Konfigurasi 0
Zyxel>>Vpn50_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abhl.3\)c0
Zyxel>>Vpn50 >> Version -
Konfigurasi 0
Zyxel>>Vpn100_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abfv.3\)c0
Zyxel>>Vpn100 >> Version -
Konfigurasi 0
Zyxel>>Vpn300_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abfc.3\)c0
Zyxel>>Vpn300 >> Version -
Konfigurasi 0
Zyxel>>Vpn1000_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(abip.3\)c0
Zyxel>>Vpn1000 >> Version -
Konfigurasi 0
Zyxel>>Zywall110_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aaaa.3\)c0
Zyxel>>Zywall110 >> Version -
Konfigurasi 0
Zyxel>>Zywall310_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aaab.3\)c0
Zyxel>>Zywall310 >> Version -
Konfigurasi 0
Zyxel>>Zywall1100_firmware >> Version Dari (termasuk) 4.35 Hingga (tidak termasuk) 4.35\(aaac.3\)c0
Zyxel>>Zywall1100 >> Version -
Referensi
Tags : x_refsource_CONFIRM
Tags : x_refsource_MISC
Tags : US Government Resource
