Klima-Pokorny-Rosa attack on RSA in SSL/TLS in OpenSSL

1) Klima-Pokorny-Rosa attack on RSA in SSL/TLS

EUVDB-ID: #VU257

Risk: High

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2003-0131

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform an unauthorized RSA private key operation.

The vulnerability exists in OpenSSL. A remote unauthenticated attacker can perform an unauthorized RSA private key operation via a modified Bleichenbacher attack that uses a large number of SSL or TLS connections using PKCS #1 v1.5 padding and cause OpenSSL to leak information regarding the relationship between ciphertext and the associated plaintext, aka the "Klima-Pokorny-Rosa attack."

Successful exploitation of this vulnerability may result in disclosure of system information.

Mitigation

Upgrade your version to OpenSSL 0.9.7b, OpenSSL 0.9.6j.

Vulnerable software versions

OpenSSL: 0.9.6 - 0.9.7a

External links

http://www.openssl.org/news/secadv/20030319.txt

Q & A

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.