Vulnerability identifier: #VU68116
Vulnerability risk: Medium
Exploitation vector: Network
Exploit availability: Yes
Vendor: OpenSSL Software Foundation
The vulnerability allows a remote attacker to decrypt traffic.
The vulnerability exists due to an error in openssl implementation when handling legacy custom ciphers with NID_undef passed to the EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() and EVP_CipherInit_ex2() functions. Under certain conditions openssl can fail to select a proper cipher and use NULL instead, which corresponds to sending data in plain text.
Note, applications are only affected by this issue if they call EVP_CIPHER_meth_new() using NID_undef and subsequently use it in a call to an encryption/decryption initialisation function.
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Vulnerable software versions
OpenSSL: 3.0.0 - 3.0.5
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?