PT-2026-47838 · Openssl+4 · Openssl+4
CVSS v3.1
3.7
Low
| Vector | AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
OpenSSL (affected versions not specified)
Description
The
CMS decrypt() and PKCS7 decrypt() functions are susceptible to a Bleichenbacher-style attack, which is an adaptive-chosen-ciphertext side channel. This allows an attacker to use a vulnerable application to decrypt or sign messages using the victim's private RSA key. The issue occurs in two scenarios: first, when the decryption API is used without a recipient certificate, OpenSSL iterates through every KeyTransRecipientInfo (KTRI) without stopping at the first success; second, when a recipient certificate is provided but the recipient is not found, a random key is substituted. In both cases, if an attacker can observe error codes or decryption output, they can establish an oracle to decrypt RSA ciphertexts or forge PKCS#1 v1.5 signatures.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Weakness Enumeration
Related Identifiers
Affected Products
Freebsd
Linuxmint
Openssl
Rocky Linux
Ubuntu