A vulnerability was found in Nimbus JOSE+JWT up to 4.38. It has been rated as critical. Affected by this issue is an unknown code block of the component AAD Handler. The manipulation with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 04/13/2017. The weakness was shared 08/20/2017 (Website). The advisory is available at bitbucket.org. This vulnerability is handled as CVE-2017-12972 since 08/20/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 129 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 4.39 eliminates this vulnerability.

The entries VDB-105616 and VDB-105615 are related to this item.

Productinfo

Vendor

• Nimbus

Name

• JOSE+JWT

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17
• 4.18
• 4.19
• 4.20
• 4.21
• 4.22
• 4.23
• 4.24
• 4.25
• 4.26
• 4.27
• 4.28
• 4.29
• 4.30
• 4.31
• 4.32
• 4.33
• 4.34
• 4.35
• 4.36
• 4.37
• 4.38

CPE 2.3info

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CPE 2.2info

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