CVE-2024-34346

Description

The Deno sandbox may be unexpectedly weakened by allowing file read/write access to privileged files in various locations on Unix and Windows platforms. For example, reading `/proc/self/environ` may provide access equivalent to `--allow-env`, and writing `/proc/self/mem` may provide access equivalent to `--allow-all`. Users who grant read and write access to the entire filesystem may not realize that these access to these files may have additional, unintended consequences. The documentation did not reflect that this practice should be undertaken to increase the strength of the security sandbox. ### Impact Users who run code with `--allow-read` or `--allow-write` may unexpectedly end up granting additional permissions via file-system operations. ### Patches Deno 1.43 and above require explicit `--allow-all` access to read or write `/etc`, `/dev` on unix platform (as well as `/proc` and `/sys` on linux platforms), and any path starting with `\\` on Windows. ### Workarounds The security sandbox in previous versions of Deno allows for denial of access to these files, but it requires an explicit addition of deny flags: `--deny-read=/dev --deny-read=/sys --deny-read=/proc --deny-read=/etc --deny-write=/dev --deny-write=/sys --deny-write=/proc --deny-write=/etc`. Note that symlinks in allowed locations may defeat this protection in earlier versions of Deno. ### Reporters This vulnerability was reported by a number of analysts. Thanks to [oliver@secfault-security.com](mailto:oliver@secfault-security.com), [finn@secfault-security.com](mailto:finn@secfault-security.com), @leesh3288, and @cristianstaicu for their reports and analysis.

How to fix CVE-2024-34346

To remediate CVE-2024-34346, upgrade the affected package to a fixed version below.

• —upgrade to 1.43.1 or later

Is CVE-2024-34346 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (1)