Juniper Junos OS prior 23.4R2 toctou

Summaryinfo

A vulnerability identified as critical has been detected in Juniper Junos OS. This vulnerability affects unknown code. Performing a manipulation results in toctou. This vulnerability is reported as CVE-2024-47494. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Juniper Junos OS. This affects some unknown functionality. The manipulation with an unknown input leads to a toctou vulnerability. CWE is classifying the issue as CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. This is going to have an impact on availability. The summary by CVE is:

A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the AgentD process of Juniper Networks Junos OS allows an attacker who is already causing impact to established sessions which generates counter changes picked up by the AgentD process during telemetry polling, to move the AgentD process into a state where AgentD attempts to reap an already destroyed sensor. This reaping attempt then leads to memory corruption causing the FPC to crash which is a Denial of Service (DoS). The FPC will recover automatically without user intervention after the crash. This issue affects Junos OS:  * All versions before 21.4R3-S9 * From 22.2 before 22.2R3-S5, * From 22.3 before 22.3R3-S4, * From 22.4 before 22.4R3-S3, * From 23.2 before 23.2R2-S2, * From 23.4 before 23.4R2. This issue does not affect Junos OS Evolved.

It is possible to read the advisory at supportportal.juniper.net. This vulnerability is uniquely identified as CVE-2024-47494 since 09/25/2024. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 211820 (Juniper Junos OS Vulnerability (JSA88121)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 21.4R3-S9, 22.2R3-S5, 22.3R3-S4, 22.4R3-S3, 23.2R2-S2 or 23.4R2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (211820). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• Juniper

Name

• Junos OS

License

• commercial

Website

• Vendor: https://www.juniper.net/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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