External risk intelligence

adlered bolo-solo File Upload Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2023-41009

The vulnerability exists in bolo-solo, a web application that facilitates file uploads. As a web-based application, it is commonly deployed to be accessible over a network. The nature of a file upload service often requires it to be reachable by users, making public or external internet-facing deployment a common pattern for such software.

Unrestricted File Upload

Adlered Bolo Solo

2.6

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the bolo-solo application, impacting its file upload functionality. This issue allows for the arbitrary execution of code remotely, posing a significant risk if exploited. The primary concern is to determine if this specific technology is in use and confirm any potential exposure.

Code execution flaw in file uploads.
Critical risk if exposed externally.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could execute arbitrary code by sending a specially crafted script through the authorization field in the header during a file upload to the bolo-solo application. This could allow them to compromise the server hosting the vulnerable software.

No authentication or user interaction required.
Uploading a malicious script via header.
Remote code execution and server compromise.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, a remote attacker could execute arbitrary code by sending a crafted script to the authorization field in the header of the bolo-solo application, potentially impacting system integrity and availability.

Arbitrary code execution.
Crafted script in header field.
System compromise and unauthorized access.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical file upload vulnerability in bolo-solo impacts application owners and infrastructure teams responsible for managing the software. The immediate priority is to identify all instances of bolo-solo, confirm their accessibility and business criticality, and then assign ownership for remediation planning.

Application owners should lead the response.
Verify bolo-solo deployment reachability and criticality.
Plan remediation based on identified risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is adlered bolo-solo?

adlered bolo-solo is a web application designed to handle file uploads. Users typically deploy it as a server-side component to manage incoming files. Because its core purpose involves processing external data, it often acts as a bridge between a network and the server's file system, which makes how it validates those files vital to security.

What does CVE-2023-41009 mean?

This vulnerability is classified as Unrestricted Upload of File with Dangerous Type (CWE-434). In simple terms, the application fails to properly verify or sanitize files before saving them. Because of this, an attacker can upload a malicious script, which the server might then mistakenly treat as a legitimate program and run, leading to complete control over the application.

How does an attacker trigger this vulnerability?

An attacker triggers this by injecting a malicious script into the authorization field within the request header during the file upload process. It is important to note that this does not require the attacker to be authenticated, nor does it require a legitimate user to click or interact with anything. The application itself processes the malicious header, which acts as the entry point for the code execution.

Is my instance of bolo-solo at risk?

According to Halo Surface Signal, this software is frequently deployed as a web-facing service, which significantly increases the risk. If your instance is reachable over the internet, it is considered external and exposed to remote attackers. You should prioritize checking any bolo-solo deployments that are accessible outside of your private network.

What steps should I take if I use this software?

Your first step is to locate all instances of bolo-solo within your infrastructure to assess how they are connected to the network. Once you have identified these systems, evaluate their business necessity and immediately restrict access to any instance that does not need to be internet-facing. Coordinate with your application owners to prioritize these assets for a security review and remediation planning.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.