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Security-focused static analysis for the Phoenix Framework

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This is Jump's fork of Sobelow. Read the original README for usage. This document just describes the changes between the fork and the upstream.

New checks

Check Rule id What it reports
Config.TLSVerify SBLW034 Disabled TLS certificate verification: literal verify: :verify_none (including Gun tls_opts maps), hackney's :insecure, and WebTransport's verify option. Scans source files and production config, and skips dev.exs and test.exs like the other config checks.
DOS.DecodeAtoms SBLW036 Dynamic input passed to a decoder with atom-creating options: Jason and Poison keys: :atoms, and YamlElixir string readers with atoms: true.
DOS.Consult SBLW037 Dynamic file selection in :file.consult/1 and :file.path_consult/2, which can create atoms from untrusted term files. Controller params get medium confidence, other dynamic paths low.
Crypto.WeakHash SBLW038 Legacy hash algorithms (MD4, MD5, SHA-1, RIPEMD-160) in :crypto hash calls and :erlang.md5/1: medium confidence in controllers, low elsewhere. HMAC-MD5 is reported at low. Only literal algorithms are inspected, never the names of the values being hashed, so a fast hash used for password storage is not reported.
Crypto.WeakCipher SBLW039 Weak ciphers passed to :crypto encryption APIs. DES, 3DES, RC2, RC4, Blowfish and ECB modes get high confidence. Unauthenticated AES modes (CBC, CTR, CFB, OFB) and raw ChaCha20 get low.

Changed behavior

Misc.BinToTerm

  • Calls to :erlang.binary_to_term/2 with an explicit :safe option are now reported at medium confidence instead of high. This changes the outcome of --exit high for projects that relied on those findings.
  • Plug.Crypto.non_executable_binary_to_term/1,2 is now covered. It rejects executable terms, but is still reported at high confidence unless :safe is also passed.
  • Computed options are never assumed safe.

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