CVE-2020-3417 : Detail

CVE-2020-3417

6.8
/
Medium
OS Command Injection
A03-Injection
0.04%V3
Adjacent
2020-09-24
18h01 +00:00
2024-11-13
17h55 +00:00
CVE.org
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CVE Descriptions

Cisco IOS XE Software Arbitrary Code Execution Vulnerability

A vulnerability in Cisco IOS XE Software could allow an authenticated, local attacker to execute persistent code at boot time and break the chain of trust. This vulnerability is due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. An attacker could exploit this vulnerability by installing code to a specific directory in the underlying operating system (OS) and setting a specific ROMMON variable. A successful exploit could allow the attacker to execute persistent code on the underlying OS. To exploit this vulnerability, the attacker would need access to the root shell on the device or have physical access to the device.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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 when it is sent to a downstream component.

Metrics

Metrics Score Severity CVSS Vector Source
V3.1 6.8 MEDIUM CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The 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.

Adjacent

The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone).

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.

High

The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable component allowing access to component-wide settings and files.

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 Metrics

The 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 Metrics

The 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 Metrics

The 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 Metrics

These 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.
V3.1 6.7 MEDIUM CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The 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.

Local

The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities.

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.

High

The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable component allowing access to component-wide settings and files.

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 Metrics

The 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 Metrics

The 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 Metrics

The 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 Metrics

These 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.

 [email protected]
V2 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Products Mentioned

Configuraton 0

Cisco>>Ios_xe >> Version 3.18.0sp

Cisco>>Ios_xe >> Version 3.18.1asp

Cisco>>Ios_xe >> Version 3.18.1bsp

Cisco>>Ios_xe >> Version 3.18.1csp

Cisco>>Ios_xe >> Version 3.18.1gsp

Cisco>>Ios_xe >> Version 3.18.1hsp

Cisco>>Ios_xe >> Version 3.18.1isp

Cisco>>Ios_xe >> Version 3.18.1sp

Cisco>>Ios_xe >> Version 3.18.2asp

Cisco>>Ios_xe >> Version 3.18.2sp

Cisco>>Ios_xe >> Version 3.18.3asp

Cisco>>Ios_xe >> Version 3.18.3bsp

Cisco>>Ios_xe >> Version 3.18.3sp

Cisco>>Ios_xe >> Version 3.18.4sp

Cisco>>Ios_xe >> Version 3.18.5sp

Cisco>>Ios_xe >> Version 3.18.6sp

Cisco>>Ios_xe >> Version 3.18.7sp

Cisco>>Ios_xe >> Version 3.18.8asp

Cisco>>Ios_xe >> Version 3.18.8sp

Cisco>>Ios_xe >> Version 16.6.1

Cisco>>Ios_xe >> Version 16.6.2

Cisco>>Ios_xe >> Version 16.6.3

Cisco>>Ios_xe >> Version 16.6.4

Cisco>>Ios_xe >> Version 16.6.4a

Cisco>>Ios_xe >> Version 16.6.4s

Cisco>>Ios_xe >> Version 16.6.5

Cisco>>Ios_xe >> Version 16.6.5a

Cisco>>Ios_xe >> Version 16.6.5b

Cisco>>Ios_xe >> Version 16.6.6

Cisco>>Ios_xe >> Version 16.6.7

Cisco>>Ios_xe >> Version 16.6.7a

Cisco>>Ios_xe >> Version 16.7.1

Cisco>>Ios_xe >> Version 16.7.1a

Cisco>>Ios_xe >> Version 16.7.1b

Cisco>>Ios_xe >> Version 16.7.2

Cisco>>Ios_xe >> Version 16.7.3

Cisco>>Ios_xe >> Version 16.7.4

Cisco>>Ios_xe >> Version 16.8.1

Cisco>>Ios_xe >> Version 16.8.1a

Cisco>>Ios_xe >> Version 16.8.1b

Cisco>>Ios_xe >> Version 16.8.1c

Cisco>>Ios_xe >> Version 16.8.1d

Cisco>>Ios_xe >> Version 16.8.1e

Cisco>>Ios_xe >> Version 16.8.1s

Cisco>>Ios_xe >> Version 16.8.2

Cisco>>Ios_xe >> Version 16.8.3

Cisco>>Ios_xe >> Version 16.9.1

Cisco>>Ios_xe >> Version 16.9.1a

Cisco>>Ios_xe >> Version 16.9.1b

Cisco>>Ios_xe >> Version 16.9.1c

Cisco>>Ios_xe >> Version 16.9.1d

Cisco>>Ios_xe >> Version 16.9.1s

Cisco>>Ios_xe >> Version 16.9.2

Cisco>>Ios_xe >> Version 16.9.2a

Cisco>>Ios_xe >> Version 16.9.2s

Cisco>>Ios_xe >> Version 16.9.3

Cisco>>Ios_xe >> Version 16.9.3a

Cisco>>Ios_xe >> Version 16.9.3h

Cisco>>Ios_xe >> Version 16.9.3s

Cisco>>Ios_xe >> Version 16.9.4

Cisco>>Ios_xe >> Version 16.9.4c

Cisco>>Ios_xe >> Version 16.9.5

Cisco>>Ios_xe >> Version 16.9.5f

Cisco>>Ios_xe >> Version 16.10.1

Cisco>>Ios_xe >> Version 16.10.1a

Cisco>>Ios_xe >> Version 16.10.1b

Cisco>>Ios_xe >> Version 16.10.1c

Cisco>>Ios_xe >> Version 16.10.1d

Cisco>>Ios_xe >> Version 16.10.1e

Cisco>>Ios_xe >> Version 16.10.1f

Cisco>>Ios_xe >> Version 16.10.1g

Cisco>>Ios_xe >> Version 16.10.1s

Cisco>>Ios_xe >> Version 16.10.2

Cisco>>Ios_xe >> Version 16.10.3

Cisco>>Ios_xe >> Version 16.11.1

Cisco>>Ios_xe >> Version 16.11.1a

Cisco>>Ios_xe >> Version 16.11.1b

Cisco>>Ios_xe >> Version 16.11.1c

Cisco>>Ios_xe >> Version 16.11.1s

Cisco>>Ios_xe >> Version 16.11.2

Cisco>>Ios_xe >> Version 16.12.1

Cisco>>Ios_xe >> Version 16.12.1a

Cisco>>Ios_xe >> Version 16.12.1c

Cisco>>Ios_xe >> Version 16.12.1s

Cisco>>Ios_xe >> Version 16.12.1t

Cisco>>Ios_xe >> Version 16.12.1w

Cisco>>Ios_xe >> Version 16.12.1x

Cisco>>Ios_xe >> Version 16.12.1y

Cisco>>Ios_xe >> Version 16.12.2

Cisco>>Ios_xe >> Version 16.12.2a

Cisco>>Ios_xe >> Version 16.12.2s

Cisco>>Ios_xe >> Version 16.12.2t

Cisco>>Ios_xe >> Version 16.12.3

Cisco>>Ios_xe >> Version 16.12.3a

Cisco>>Ios_xe >> Version 17.1.1

Cisco>>Ios_xe >> Version 17.1.1a

Cisco>>Ios_xe >> Version 17.1.1s

Cisco>>Ios_xe >> Version 17.1.1t

References