6.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-42446

CVE-2023-42446: Pow Mnesia cache doesn't invalidate all expired keys on startup

Use of Pow.Store.Backend.MnesiaCache is susceptible to session hijacking as expired keys are not being invalidated correctly on startup. A cache key may become expired when all Pow.Store.Backend.MnesiaCache instances have been shut down for a period that is longer than the keys' remaining TTL and the expired key won't be invalidated on startups.

Workarounds

The expired keys, including all expired sessions, can be manually invalidated by running:

:mnesia.sync_transaction(fn ->
  Enum.each(:mnesia.dirty_select(Pow.Store.Backend.MnesiaCache, [{{Pow.Store.Backend.MnesiaCache, :_, :_}, [], [:"$_"]}]), fn {_, key,  {_value, expire}} ->
    ttl = expire - :os.system_time(:millisecond)
    if ttl < 0, do: :mnesia.delete({Pow.Store.Backend.MnesiaCache, key})
  end)
end)

References

https://github.com/pow-auth/pow/commit/15dc525be03c466daa5d2119ca7acdec7b24ed17 https://github.com/pow-auth/pow/issues/713 https://github.com/pow-auth/pow/pull/714

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-42446

CVE-2023-42446:

6.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
pow	erlang	>= 1.0.14, < 1.0.34	1.0.34

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper handling of namespaces during cache initialization. The commit diff shows a critical change in the :mnesia.foldl block where the key is split into [namespace | key] and the config is updated with the namespace before calling append_invalidator. In the vulnerable version, the namespace wasn't extracted, leading to invalidators being scheduled without proper context. This caused expired keys (especially those persisted across restarts) to remain active. The test cases in mnesia_cache_test.exs were also updated to reflect proper namespace separation, confirming the root cause.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Protection Rules

WAF Rule

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Reasoning

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