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How the Mentioned CVE Works (CVE-2025-62550)
The vulnerability is an out-of-bounds write in the Azure Monitor Agent, classified as CWE-787. It stems from an incorrect calculation of buffer size (CWE-131). This flaw allows an authorized attacker with low-privilege network access to trigger a buffer overflow. By sending specially crafted data over the network, the attacker can write beyond the bounds of an allocated buffer in the agent’s memory. This memory corruption can then be leveraged to execute arbitrary code remotely on the affected system, compromising its confidentiality, integrity, and availability. The attack requires network access and low-privileged credentials but no user interaction.
dailycve form:
Platform: Azure Monitor Agent
Version: Before 1.35.9
Vulnerability: Out-of-bounds Write
Severity: High
date: 2025-12-09
Prediction: 2025-12-09
What Undercode Say:
Analytics:
Check installed Azure Monitor Agent version
Get-WmiObject -Namespace root\cimv2 -Class Win32_Product | Where-Object {$_.Name -like "Azure Monitor Agent"} | Select-Object Name, Version
Query system for potential crash dumps related to the agent
Get-ChildItem -Path $env:SystemRoot\LiveKernelReports -Filter .dmp -ErrorAction SilentlyContinue
Monitor network connections for the agent process
Get-NetTCPConnection -OwningProcess (Get-Process -Name AMA).Id -ErrorAction SilentlyContinue
How Exploit:
An attacker with a valid low-privileged account on the network sends a malicious network packet to the Azure Monitor Agent. The packet contains data designed to exploit the incorrect buffer calculation, causing an out-of-bounds write. This corrupts adjacent memory structures, potentially allowing the attacker to overwrite a function pointer or return address. When the corrupted memory is accessed by the agent, it redirects execution flow to the attacker’s embedded shellcode, leading to remote code execution with the privileges of the Azure Monitor Agent service.
Protection from this CVE:
Update agent to version 1.35.9 or later.
Restrict network access to agent endpoints.
Implement network segmentation controls.
Monitor for suspicious agent activity.
Impact:
Remote arbitrary code execution.
Full system compromise potential.
High confidentiality, integrity, and availability impact.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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