CVE-2017-12972

Description

In Nimbus JOSE+JWT before 4.39, there is no integer-overflow check when converting length values from bytes to bits, which allows attackers to conduct HMAC bypass attacks by shifting Additional Authenticated Data (AAD) and ciphertext so that different plaintext is obtained for the same HMAC.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.21%
Third-Party Advisory bitbucket.org Third-Party Advisory bitbucket.org Third-Party Advisory bitbucket.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/224/byte-to-bit-overflow-in-cbc third party advisory patch
https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/0d2bd649ea386539220d4facfe1f65eb1dadb86c third party advisory
https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt third party advisory release notes
https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E mailing list

Frequently Asked Questions

What is the severity of CVE-2017-12972?
CVE-2017-12972 has been scored as a high severity vulnerability.
How to fix CVE-2017-12972?
To fix CVE-2017-12972, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-12972 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2017-12972 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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