Vulnerability identifier: #VU68116
Vulnerability risk: Medium
CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-326
Exploitation vector: Network
Exploit availability: Yes
Vulnerable software:
OpenSSL
Server applications /
Encryption software
Vendor: OpenSSL Software Foundation
Description
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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
OpenSSL: 3.0.0 - 3.0.5
External links
http://www.openssl.org/news/secadv/20221011.txt
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=5485c56679d7c49b96e8fc8ca708b0b7e7c03c4b
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.