What Are Supply Chain Attacks
A supply chain attack targets not the intended victim directly, but rather a trusted third party — a software vendor, library developer, or hardware manufacturer — as the entry point. The attack reaches the ultimate target through this chain of trust.
Modern software depends on countless open-source libraries and external services. If any single link in this dependency chain (the supply chain) is compromised, the impact cascades to every downstream user. By exploiting chains of trust, supply chain attacks are fundamentally different from conventional attack methods.
Notable Incidents
SolarWinds (2020)
The build system of IT management software SolarWinds Orion was compromised, and a backdoor was embedded in a legitimate software update. This update was distributed to approximately 18,000 organizations, including US government agencies. Because it exploited the legitimate update mechanism, detection was extremely difficult.
Codecov (2021)
The CI/CD script of code coverage tool Codecov was tampered with, causing users' environment variables — including authentication credentials and tokens — to be exfiltrated. By targeting the CI/CD pipeline, a core part of the development process, the attack compromised confidential information from numerous companies.
Malicious Packages (npm / PyPI)
There has been a growing number of cases where malicious packages with names closely resembling legitimate ones are published to package repositories like npm and PyPI. Through typosquatting (exploiting typing mistakes) and dependency confusion attacks, developers may inadvertently incorporate malicious code into their projects.
Software Supply Chain Vulnerabilities
The software supply chain presents multiple attack surfaces.
- Open-source dependencies — it is not uncommon for a single project to depend on hundreds of libraries, making it practically impossible to audit them all
- Package managers — npm, pip, Maven, and other package managers can themselves become attack targets
- Build systems — malicious code can be injected during the process of compiling source code into binaries
- CI/CD pipelines — if the continuous integration and delivery automation process is compromised, the impact reaches production environments directly
Hardware Supply Chain Risks
Supply chain attacks are not limited to software. The hardware manufacturing and distribution process also carries risks.
- Pre-installed malware — malware can be planted on devices during manufacturing or distribution
- Firmware tampering — if device firmware is altered, OS-level security measures may fail to detect it
- Counterfeit components — fake chips and components disguised as genuine parts may contain backdoors
- Man-in-the-middle attacks — there is a non-zero risk of devices being intercepted and physically tampered with during shipping
Hardware-level attacks are extremely difficult to detect, and device encryption alone may not provide adequate defense. Purchasing devices from trusted manufacturers and sales channels is a fundamental protective measure. From an API security perspective, verifying the trustworthiness of API endpoints that hardware communicates with is also important.
Individual-Level Defenses
While supply chain attacks are sophisticated, there are steps individuals can take to reduce their risk.
- Keep software up to date — security patches are released to fix discovered vulnerabilities
- Download only from official sources — always obtain software from the developer's official website or official app stores
- Verify checksums — compare the hash value of downloaded files against the official value to confirm they have not been tampered with
- Use reputable app stores — the Apple App Store and Google Play Store subject apps to a review process before publication
- Be cautious with browser extensions — extensions can have broad permissions, and malicious ones can steal browsing data
- Watch for suspicious software updates — malware can disguise itself as legitimate update notifications
As with ransomware protection, maintaining everyday security awareness is the most effective defense.
Organizational-Level Defenses
Organizations need a systematic approach to counter supply chain attacks.
- SBOM (Software Bill of Materials) management — catalog all components and their dependencies in your software to enable vulnerability tracking
- Dependency scanning — use automated tools to continuously monitor libraries for known vulnerabilities
- Code signing verification — implement mechanisms to cryptographically verify that software comes from a legitimate distributor
- Vendor assessment — regularly evaluate the security posture of third parties and understand the associated risks
- Zero trust approach — treat every component in the supply chain as a potential threat and perform continuous verification
Due to their nature of exploiting trust relationships, supply chain attacks are difficult to defend against completely. However, layered defenses can significantly reduce the risk. Whether as an individual or an organization, raising awareness of supply chain security is essential.