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Semgrep identified an issue in your code:
The call to 'createDecipheriv' with the Galois Counter Mode (GCM) mode of operation is missing an expected authentication tag length. If the expected authentication tag length is not specified or otherwise checked, the application might be tricked into verifying a shorter-than-expected authentication tag. This can be abused by an attacker to spoof ciphertexts or recover the implicit authentication key of GCM, allowing arbitrary forgeries.
To resolve this comment:
✨ Commit Assistant fix suggestion
View step-by-step instructions
authTagLength
property set to 16 as the fourth parameter tocrypto.createDecipheriv
. For example:const decipher = crypto.createDecipheriv('aes-256-gcm', key, Buffer.from(ivHex, 'hex'), { authTagLength: 16 });
authTagLength
matches the length of the authentication tag you use when callingdecipher.setAuthTag
.In AES-GCM, a typical tag length is 16 bytes (128 bits). This helps prevent attackers from supplying shorter authentication tags when decrypting.
createDecipheriv
with a GCM mode in your codebase to use theauthTagLength
option as well.💬 Ignore this finding
Reply with Semgrep commands to ignore this finding.
/fp <comment>
for false positive/ar <comment>
for acceptable risk/other <comment>
for all other reasonsAlternatively, triage in Semgrep AppSec Platform to ignore the finding created by gcm-no-tag-length.
Questions about this issue? Reach out to Product Security in #prodsec-tools.
You can view more details about this finding in the Semgrep AppSec Platform.