CyberRota Analysis
AI-GeneratedThe vulnerability arises from a missing cryptographic step in the KCcmBlockCipher implementation, allowing attackers to forge ciphertexts with valid authentication tags when messages are encrypted without associated data. This flaw can lead to unauthorized access or manipulation of sensitive information, particularly affecting applications that utilize this cipher directly without providing associated data. Developers and security teams using the affected Bouncy Castle library versions should prioritize patching to mitigate the risk of exploitation.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Missing cryptographic step in the DSTU 7624 CCM mode implementation (KCcmBlockCipher) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypted without associated data. The cause is that the G1 block, which binds the nonce, the message length and the parameter flags into the CBC-MAC, was processed only when associated data was present. Without associated data the tag was a CBC-MAC of the plaintext alone, independent of the nonce. Only applications that use KCcmBlockCipher directly and supply no associated data are affected.