pbkdf2 rehashes long passwords on every iteration, enabling denial of service
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| browserify | pbkdf2 | unaffected |
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No data.
No data.
| Vendor | Product | Versions | ||||||||
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| Browserify | Pbkdf2 |
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Vendor Solution
Upgrade to a version of pbkdf2 that includes the fix, which pre-hashes passwords longer than the digest block size once before iterating, or, enforce literally any reasonable maximum password length before calling pbkdf2.
Vendor Workaround
Enforce a maximum password length (for example, 1024 bytes) before calling pbkdf2, or call the runtime's native crypto.pbkdf2Sync directly.
| Source | ID | Title |
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Github GHSA |
GHSA-477h-4r7f-fvrx | pbkdf2 rehashes long passwords on every iteration, enabling denial of service |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.345% probability within 30 days)
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| Metrics |
ssvc
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| First Time appeared |
Browserify
Browserify pbkdf2 |
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| Vendors & Products |
Browserify
Browserify pbkdf2 |
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| Description | pbkdf2 through 3.1.6 re-hashes passwords longer than the digest's block size on every iteration in its JavaScript fallback (lib/sync.js). A password longer than the block size (64 bytes, or 128 bytes for sha384 and sha512) is passed to HMAC as the key on every iteration, and HMAC hashes such keys in full each time. Cost is therefore O(iterations × password length), and a long password can block the event loop. The fallback is used by pbkdf2Sync and pbkdf2 on Node.js before 0.12, on Bun (1.0.0 through 1.1.34, and 1.2.6 and later), and on Deno 2.9.0 and later, because their native pbkdf2Sync fails the library's feature check. It is also used when lib/sync.js is imported directly. Node.js 0.12 and later, and browser builds (which use lib/sync-browser.js), are not affected. Applications that enforce a reasonable maximum password length are not meaningfully affected. | |
| Title | pbkdf2 rehashes long passwords on every iteration, enabling denial of service | |
| Weaknesses | CWE-400 | |
| References |
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| Metrics |
cvssV3_1
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