fix(Security): Don't attempt empty secret fallback on >=v3 ciphertext #46176
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Signed-off-by: Josh <josh.t.richards@gmail.com>
joshtrichards
added
bug
3. to review
joshtrichards
requested review from
nickvergessen,
ChristophWurst,
juliushaertl,
kesselb and
come-nc
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/backport to stable29 |
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/backport to stable28 |
Signed-off-by: Josh Richards <josh.t.richards@gmail.com>
come-nc
reviewed
Jun 27, 2024
| $version = $parts[3]; | ||
| } | ||
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|
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| if ((!empty($version) && $version <= '2') || empty($version)) { // only <3 versioned or old non-versioned ciphertext ever supported empty secrets |
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Suggested change
| if ((!empty($version) && $version <= '2') || empty($version)) { // only <3 versioned or old non-versioned ciphertext ever supported empty secrets | |
| if (empty($version) || $version <= '2') { // only <3 versioned or old non-versioned ciphertext ever supported empty secrets |
Comment on lines
-113
to
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| if ($partCount < 3 || $partCount > 4) { | ||
| throw new Exception('Authenticated ciphertext could not be decoded.'); | ||
| } |
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Why is this removed?
Should be added back.
Merged
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Summary
The v3 ciphertext format (added in #23496) has never worked with an empty secret/password. However, the v3 implementation was added prior to the existence of the empty secret fallback code added in #31499.
While looking into #34012 I noted that the only reason the
hash_hkdf()PHP ValueError is occurring is because the fallback is being attempted not only anytime the initial decrypt attempt fails, but also against newer ciphertext versions (where the fallback isn't relevant).This PR adjusts the fallback logic to only run against <=2 versioned or non-versioned (which is even older) ciphertext.
Note: This does not fix the underlying cause of #34012 (which is probably in at least most cases a configuration problem), but it does:
References:
TODO
Checklist