Do you mean:
If you want option 1 or a press-style feature, I’ll produce a structured article. If you want option 2, I can’t help produce exploit code or instructions that enable wrongdoing. Which do you want?
The story of the "Baget Exploit" of 2021 is a classic tale of how a simple coding oversight can lead to a massive digital "gold rush." In the tech underground, "Baget" (a play on the French
) was the internal codename for a specific vulnerability found in a popular decentralized finance (DeFi) protocol’s yield-farming smart contract. The Discovery
In early November 2021, a pseudonymous developer known only as "Boulanger"
noticed a flaw in the protocol’s "Stale Price" logic. The contract relied on an external price feed to determine the value of collateral. However, "Boulanger" realized that if the network became congested, the "freshness" check on the price data could be bypassed by a specific sequence of rapid-fire transactions. The Exploit
The exploit didn't involve stealing funds directly. Instead, it was an infinite minting glitch The attacker would deposit a small amount of a stablecoin.
By "stretching" the transaction timing (the "Baget" technique), they tricked the contract into thinking the price of a worthless reward token was equal to Bitcoin.
The system, seeing a massive (but fake) collateral value, allowed the attacker to "borrow" millions in real assets. The "Crusty" Aftermath
On November 14, 2021, the exploit went live. Within three hours, $12.4 million was drained into a series of "bread-themed" crypto wallets. The community dubbed it the "Baget Exploit" because the attacker left a single message in the transaction data: “The dough must rise.” The Resolution
Unlike many 2021 hacks, this one had a "yeasty" twist. After the developers pleaded for the return of funds to save the project, Boulanger—acting as a "Grey Hat" hacker—returned 90% of the stolen assets. They kept the remaining 10% as a "baking fee" and disappeared from the internet, leaving behind only a recipe for a perfect sourdough starter on their GitHub profile.
The phrase "baget exploit 2021" appears to refer to cybercriminal activity linked to Maksim Mikhailov , a Russian developer known by the online moniker "
". He was one of several individuals sanctioned by the US and UK in early 2023 for their involvement with the Trickbot group. Key details related to this topic from 2021 include: Malware Development: "
" is identified as a developer for the Trickbot group, which is responsible for various ransomware and malware projects.
Diavol Ransomware: Internal data leaked from the Conti ransomware group in 2021 suggested that " " was the primary developer of the Diavol ransomware.
Backdoor Activity: In 2021, security researchers noted that threat actors often used the same backdoors (such as Cobalt Strike) left by groups like Conti to gain persistent access to victim networks. Infrastructure : Individuals like
("Baget") worked within a highly organized ecosystem where ransomware and infrastructure were leased out to other attackers under a "Ransomware-as-a-Service" model.
While "Baget" is a person, not a specific vulnerability name (like Log4j), the search for this term typically surfaces reports on the ContiLeaks of 2021 and the subsequent doxing of the Trickbot gang's key members. The Karakurt Web: Threat Intel and Blockchain Analysis
The "Baget" Vulnerability: Unpacking the 2021 BaGet NuGet Server Exploits baget exploit 2021
In the world of software development, the "supply chain" is only as strong as its weakest link. In 2021, a significant focus shifted toward , an open-source, lightweight NuGet server implementation often used by teams to host private packages.
While BaGet is prized for its simplicity, security researchers identified critical vulnerabilities that could allow attackers to compromise the environments where it was deployed. Here is a breakdown of what happened and why it matters for developers today. What is the BaGet Exploit?
In mid-2021, security analyses of off-the-shelf packages hosted on repositories like NuGet revealed dozens of high-severity vulnerabilities. Specifically, BaGet versions were found susceptible to several attack vectors: Arbitrary File Upload:
Researchers discovered that the system failed to adequately sanitize user-supplied input. An attacker could exploit this to upload malicious files—such as web shells—to the server. Remote Code Execution (RCE):
By bypassing image upload filters or exploiting the arbitrary file upload flaw, attackers could execute commands in the context of the web server process. Authentication Bypass:
Some versions suffered from simple bypasses, where attackers could gain administrative access with basic SQL injection techniques (e.g., using admin' or ''=' -- as a username). Timeline of Discovery The exploits gained public attention in September 2021: September 20, 2021: Authentication Bypass
vulnerability was documented by researcher Prunier Charles-Yves. September 21, 2021:
Abdullah Khawaja (hax.3xploit) published a proof-of-concept for Unauthenticated Remote Code Execution (RCE) September 23, 2021: Arbitrary File Upload
exploit was released, detailing how attackers could gain a shell on the hosting Linux server. Why This Was a Big Deal The year 2021 was dubbed the " Year of the 0-day
" due to the sheer volume of high-profile supply chain attacks. Because BaGet is often used as a private internal server, a compromise here meant an attacker could potentially inject malicious code into a company's internal software updates—a classic supply chain attack. How to Stay Secure
If you are still running legacy versions of BaGet or similar self-hosted NuGet servers, the lessons from 2021 remain vital: Update Immediately: Ensure you are running the latest version of or have migrated to a more robustly maintained solution. Strict Sanitization:
Always sanitize file uploads and validate that only expected file types (like ) are accepted. Principle of Least Privilege:
Run the server with the minimum necessary permissions to prevent an RCE from turning into a full system compromise.
The BaGet exploits serve as a reminder that even "lightweight" internal tools require heavy-duty security oversight. Stay patched, stay alert, and always verify your third-party dependencies.
Budget and Expense Tracker System 1.0 - Arbitrary File Upload
, a template-augmented exploit code generation framework developed in part by Marc Baget and published around Key Features of ExploitGen
Based on research into the work of Marc Baget and Mohamed Abdel-Nasser, the "exploit" framework (often associated with their 2020-2021 publications on deep transfer learning) focuses on the following features: Template-Augmented Generation
: Unlike standard code generators, it uses pre-defined templates to guide the creation of exploit code, ensuring the output follows functional security patterns. CodeBERT Integration : It leverages Do you mean:
, a bimodal model trained on natural language and programming languages, to better understand the semantics of vulnerabilities. Deep Transfer Learning
: The system applies transfer learning to model source code effectively, allowing it to generate relevant exploit scripts even with limited specific training data. Automated Exploit Proof-of-Concept (PoC)
: The primary goal is the automated generation of PoC code to help security researchers identify and verify software vulnerabilities quickly. Alternative Contexts Roblox/Gaming
: In some niche gaming communities, "Baget" or "Baguette" may refer to short-lived, custom script executors or "exploits" released on forums like Exploit.in
or GitHub in 2021. However, these are often unofficial and lack formal documentation. Scientific Modeling
: "Baget" is also the name of a karst catchment model used in environmental science for hydrochemical analysis, though this is unrelated to cybersecurity "exploits." ScienceDirect.com technical documentation for a specific software named "Baget"?
The Baget exploit (CVE-2021-3490) is a critical vulnerability discovered in 2021 that affects the Linux kernel's eBPF (Extended Berkeley Packet Filter) verifier. It allows a local user to escalate their privileges to root by bypassing security checks within the kernel. Core Vulnerability Details CVE ID: CVE-2021-3490
Discovery: Identified by Manfred Paul during the Pwn2Own Vancouver 2021 competition.
Nature of Bug: It is a "type confusion" or "incorrect bounds tracking" vulnerability. The eBPF verifier failed to properly track the boundaries of 32-bit ALU (Arithmetic Logic Unit) operations, leading to out-of-bounds reads and writes in kernel memory.
Impact: A local attacker can gain full administrative (root) control over the affected system. Technical Breakdown
eBPF Verifier: The Linux kernel uses a "verifier" to ensure that eBPF programs (user-supplied code) are safe to run and won't crash the system.
The Flaw: The verifier incorrectly calculated the possible range of values for registers after certain bitwise operations (like AND, OR, XOR).
The Exploit: By crafting a specific sequence of eBPF instructions, an attacker can trick the verifier into thinking a memory access is safe (within bounds) when it actually points to a location outside the intended buffer.
Privilege Escalation: Once out-of-bounds access is achieved, the attacker can overwrite kernel structures, such as the cred (credentials) structure of their own process, to change their UID to 0 (root). Affected Systems
The exploit targets Linux kernel versions released primarily in 2020 and early 2021.
Kernel Versions: Specifically versions between 5.7 and 5.12.3.
Distributions: Many popular distros were vulnerable at the time, including Ubuntu 20.04/21.04, Debian 10/11, and Fedora. How to Check and Fix
Check Kernel Version: Run uname -rs in your terminal. If your version is within the 5.7 to 5.12.3 range and has not been patched, you may be at risk. Remediation: Write a technical article/feature about the "baget exploit
Update: Run your distribution's update manager (e.g., sudo apt update && sudo apt upgrade) to install the latest stable kernel.
Mitigation: If you cannot reboot or update immediately, you can restrict access to eBPF to root users only by setting:sysctl -w kernel.unprivileged_bpf_disabled=1 Safety Note
The "Baget" exploit is a well-known security research tool and has been integrated into frameworks like Metasploit. It should only be used for authorized penetration testing or educational purposes on systems you own.
(often abbreviated or misspelled as "BaGet" in some contexts) that were disclosed in September 2021.
The primary vulnerabilities allowed attackers to gain full control of a web server through Unauthenticated Remote Code Execution (RCE) Key Vulnerabilities (September 2021) Unauthenticated RCE (Arbitrary File Upload)
This is the most significant exploit associated with the system. Attackers could bypass image upload filters to upload a malicious PHP file. Because the application did not adequately sanitize user-supplied input, an unauthenticated user could execute commands directly on the hosting web server. Arbitrary File Upload via
A specific proof-of-concept (PoC) was released demonstrating how a POST request to /expense_budget/classes/Users.php?f=save
could be used to upload arbitrary files in the context of the web server process. Exploit Availability
Automated exploit scripts (e.g., in Python) were made publicly available on platforms like Exploit-DB
, allowing even low-skilled attackers to compromise vulnerable installations by simply providing the target URL. Exploit-DB Potential Confusions
While the "Budget and Expense Tracker" is the most likely match for an "exploit," the name is often confused with: BaGet (NuGet Server) : A lightweight NuGet and symbol server
that also had significant updates and discussions around its maintenance status in September 2021. Baget-55-06
: A central computer used in the modernization of the MiG-31BM aircraft, though this is a hardware component and not typically associated with a 2021 "exploit" trend.
Disclaimer: This article is for educational and historical documentation purposes only. The information provided is intended to help cybersecurity professionals, system administrators, and students understand past threats to better defend against future ones. Unauthorized access to computer systems is illegal.
| Factor | Assessment | |--------|-------------| | Privileges required | Low (any local user) | | User interaction | None | | Complexity | Low (scriptable, reliable) | | Confidentiality impact | High (read any file) | | Integrity impact | High (modify system) | | Availability impact | High (full system compromise) |
A successful exploit allows:
/etc/shadow, SSH keys, etc.).In early 2021, the cybersecurity world was rocked by one of the most devastating server-side exploit chains in recent history. While the technical community focused on the now-infamous ProxyLogon vulnerabilities (CVE-2021-26855, CVE-2021-27065, et al.), a specific, aggressive malware family capitalized on these flaws with ruthless efficiency: Baget (also tracked as ProxyShellon or simply the "Baget backdoor").
The "Baget Exploit 2021" refers not to a single piece of code, but to a coordinated campaign between January and March 2021 (extending into mid-year) where threat actors used unpatched Microsoft Exchange servers as entry points to deploy the Baget trojan. This article dissects the exploit chain, the malware’s functionality, the scale of the attacks, and the lasting lessons for enterprise security.
CVE-2021-4034 (exploited by BAGET and others) is a severe local privilege escalation vector affecting virtually all Linux systems prior to 2022 patching. It requires no special configuration, is trivial to execute, and reliably grants root access. All organizations must ensure Polkit is updated to a patched version and monitor for suspicious pkexec executions.
Report Date: 2026-04-19
Vulnerability Discovered: 2021 (Public Disclosure: January 25, 2022)
Exploit Name: BAGET (also known as PwnKit, pkexec LPE)
Affected Component: pkexec – part of PolicyKit (Polkit)
CVSS Score: 7.8 (High) – AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H