Mô tả CVE

Junos OS: A race condition in the storm control profile may allow an attacker to cause a Denial of Service condition

A signal handler race condition exists in the Layer 2 Address Learning Daemon (L2ALD) of Juniper Networks Junos OS due to the absence of a specific protection mechanism to avoid a race condition which may allow an attacker to bypass the storm-control feature on devices. This issue is a corner case and only occurs during specific actions taken by an administrator of a device under certain specifics actions which triggers the event. The event occurs less frequently on devices which are not configured with Virtual Chassis configurations, and more frequently on devices configured in Virtual Chassis configurations. This issue is not specific to any particular Junos OS platform. An Indicator of Compromise (IoC) may be seen by reviewing log files for the following error message seen by executing the following show statement: show log messages | grep storm Result to look for: /kernel: GENCFG: op 58 (Storm Control Blob) failed; err 1 (Unknown) This issue affects: Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D49 on EX Series; 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D191, 15.1X49-D200 on SRX Series; 16.1 versions prior to 16.1R7-S7; 16.2 versions prior to 16.2R2-S11, 16.2R3; 17.1 versions prior to 17.1R2-S11, 17.1R3; 17.2 versions prior to 17.2R2-S8, 17.2R3-S3; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S5; 18.2 versions prior to 18.2R2-S6, 18.2R3; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R1-S5, 18.4R2; 19.1 versions prior to 19.1R1-S4, 19.1R2.

Giải pháp CVE

The following software releases have been updated to resolve this specific issue: 14.1X53-D49, 15.1R7-S6, 15.1X49-D191, 15.1X49-D200, 15.1X53-D592, 16.1R7-S7, 16.1R8, 16.2R2-S11, 16.2R3, 17.1R2-S11, 17.1R3, 17.2R2-S8, 17.2R3-S3, 17.3R2-S5, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S5, 18.2R2-S6, 18.2R3, 18.3R1-S7, 18.3R2-S3, 18.3R3, 18.4R1-S5, 18.4R2, 19.1R1-S4, 19.1R2, 19.2R1, and all subsequent releases.

Thông tin CVE

Điểm yếu liên quan

CWE-ID	Tên điểm yếu	Nguồn
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Số liệu

Số liệu	Điểm	Mức độ nghiêm trọng	CVSS Vector	Nguồn
V3.1	7.4	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H Thêm thông tin 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. 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. Required Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator. 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. Changed An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities. 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. None There is no loss of confidentiality within the impacted component. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. None There is no loss of integrity within 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.
V2	4.3		AV:N/AC:M/Au:N/C:N/I:N/A:P	nvd@nist.gov

EPSS

EPSS là mô hình tính điểm dự đoán khả năng một lỗ hổng bị khai thác.

Điểm EPSS

Mô hình EPSS tạo ra điểm xác suất từ 0 đến 1 (0 đến 100%). Điểm càng cao, xác suất một lỗ hổng bị khai thác càng lớn.

Phân vị EPSS

Phân vị được dùng để xếp hạng CVE theo điểm EPSS. Ví dụ, một CVE ở phân vị thứ 95 theo điểm EPSS có nhiều khả năng bị khai thác hơn 95% CVE khác. Do đó, phân vị được dùng để so sánh điểm EPSS của một CVE với các CVE khác.

EPSS First.org

Sản phẩm được đề cập

Cấu hình 0

Juniper>>Junos >> Version 14.1x53

Juniper>>Ex2300 >> Version -

Juniper>>Ex2300-c >> Version -

Juniper>>Ex3400 >> Version -

Juniper>>Ex4300 >> Version -

Juniper>>Ex4400 >> Version -

Juniper>>Ex4600 >> Version -

Juniper>>Ex4650 >> Version -

Juniper>>Ex9200 >> Version -

Juniper>>Ex9250 >> Version -

Cấu hình 0

Juniper>>Junos >> Version 15.1

Juniper>>Junos >> Version 16.1

Juniper>>Junos >> Version 16.2

Juniper>>Junos >> Version 17.1

Juniper>>Junos >> Version 17.2

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.4

Juniper>>Junos >> Version 18.1

Juniper>>Junos >> Version 18.2

Juniper>>Junos >> Version 18.3

Juniper>>Junos >> Version 19.1

Cấu hình 0

Juniper>>Junos >> Version 15.1x49

Juniper>>Srx1500 >> Version -

Juniper>>Srx300 >> Version -

Juniper>>Srx320 >> Version -

Juniper>>Srx340 >> Version -

Juniper>>Srx345 >> Version -

Juniper>>Srx380 >> Version -

Juniper>>Srx4100 >> Version -

Juniper>>Srx4200 >> Version -

Juniper>>Srx4600 >> Version -

Juniper>>Srx5400 >> Version -

Juniper>>Srx550 >> Version -

Juniper>>Srx5600 >> Version -

Juniper>>Srx5800 >> Version -

Tài liệu tham khảo

https://kb.juniper.net/JSA11137
Tags : x_refsource_MISC

Ngày	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2021-05-02	0.42%	–	–	–	–
2021-09-05	–	0.42%	–	–	–
2021-12-26	–	0.42%	–	–	–
2022-01-09	–	1.84%	–	–	–
2022-01-16	–	1.84%	–	–	–
2022-02-06	–	–	2.56%	–	–
2022-03-27	–	–	2.56%	–	–
2022-04-03	–	–	0.89%	–	–
2022-04-24	–	–	0.89%	–	–
2022-07-17	–	–	0.89%	–	–
2022-10-09	–	–	0.89%	–	–
2023-02-19	–	–	0.89%	–	–
2023-03-12	–	–	–	0.09%	–
2023-10-15	–	–	–	0.09%	–
2024-02-11	–	–	–	0.09%	–
2024-03-31	–	–	–	0.09%	–
2024-06-02	–	–	–	0.09%	–
2024-09-15	–	–	–	0.09%	–
2024-09-22	–	–	–	0.09%	–
2024-10-13	–	–	–	0.09%	–
2024-12-15	–	–	–	0.09%	–
2024-12-22	–	–	–	0.11%	–
2025-01-19	–	–	–	0.11%	–
2025-01-19	–	–	–	0.11%	–
2025-03-18	–	–	–	–	0.21%
2025-03-30	–	–	–	–	0.21%
2025-04-15	–	–	–	–	0.21%
2025-05-01	–	–	–	–	0.21%
2025-05-05	–	–	–	–	0.21%
2025-05-09	–	–	–	–	0.21%
2025-05-11	–	–	–	–	0.21%
2025-05-16	–	–	–	–	0.21%
2025-06-16	–	–	–	–	0.21%
2025-06-18	–	–	–	–	0.21%
2025-06-19	–	–	–	–	0.21%
2025-07-01	–	–	–	–	0.21%
2025-07-04	–	–	–	–	0.21%
2025-08-01	–	–	–	–	0.21%
2025-08-02	–	–	–	–	0.21%
2025-11-18	–	–	–	–	0.25%
2025-11-21	–	–	–	–	0.21%

Ngày	Phân vị
2021-05-02	–
2021-09-05	26%
2021-12-26	27%
2022-01-09	47%
2022-01-16	48%
2022-02-06	62%
2022-03-27	63%
2022-04-03	24%
2022-04-24	25%
2022-07-17	26%
2022-10-09	27%
2023-02-19	28%
2023-03-12	37%
2023-10-15	38%
2024-02-11	37%
2024-03-31	38%
2024-06-02	39%
2024-09-15	4%
2024-09-22	39%
2024-10-13	4%
2024-12-15	41%
2024-12-22	44%
2025-01-19	45%
2025-01-19	45%
2025-03-18	41%
2025-03-30	4%
2025-04-15	43%
2025-05-01	44%
2025-05-05	43%
2025-05-09	44%
2025-05-11	43%
2025-05-16	44%
2025-06-16	43%
2025-06-18	44%
2025-06-19	43%
2025-07-01	44%
2025-07-04	43%
2025-08-01	44%
2025-08-02	43%
2025-11-18	44%
2025-11-21	43%

CVE-2021-0244 : Chi tiết

CVE-2021-0244

Mô tả CVE

Junos OS: A race condition in the storm control profile may allow an attacker to cause a Denial of Service condition

Giải pháp CVE

Thông tin CVE

Điểm yếu liên quan

Số liệu

Base: Exploitabilty Metrics

Base: Scope Metrics

Base: Impact Metrics

Temporal Metrics

Environmental Metrics

EPSS

Điểm EPSS

Phân vị EPSS

Sản phẩm được đề cập

Cấu hình 0

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Tài liệu tham khảo