A Network Allow-List Won't Stop Exfiltration
The article discusses the limitations of network allow-lists in preventing data exfiltration from untrusted code. It highlights that while allow-lists can block unauthorized connections, they cannot detect data being sent through authorized channels. The piece emphasizes the need for more robust solutions, such as L7 egress proxies with data-loss prevention features, to address these vulnerabilities.
- ▪Network allow-lists can prevent unauthorized connections but fail to stop data exfiltration through authorized channels.
- ▪Recent incidents in the software supply chain have shown that package registries can be exploited to harvest credentials.
- ▪Implementing an L7 egress proxy with data-loss prevention can help mitigate the risks associated with data leaving through allowed connections.
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A Network Allow-List Won't Stop ExfiltrationMay 18, 2026· 9 min readSay you run a piece of untrusted code – an AI-generated script, a dependency’s postinstall hook, a build step from a repo you just cloned – inside a sandbox. You lock it down: no filesystem access outside the working directory, no network except the one domain it legitimately needs, no dangerous syscalls. That stops a lot of bad behavior.It also has a blind spot, and it’s a big one.I ran into this building Canister, a lightweight, unprivileged Linux sandbox – it stacks user namespaces, seccomp, and network isolation to run untrusted commands with minimal privileges, no root and no container runtime. But the blind spot below isn’t specific to Canister.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Dergraf.
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