FreeBSD : openssl -- Incorrect PKCS#1 v1.5 padding validation in crypto(3) (077c2dca-8f9a-11db-ab33-000e0c2e438a)

medium Nessus Plugin ID 23951

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

Problem Description When verifying a PKCS#1 v1.5 signature, OpenSSL ignores any bytes which follow the cryptographic hash being signed. In a valid signature there will be no such bytes. Impact OpenSSL will incorrectly report some invalid signatures as valid. When an RSA public exponent of 3 is used, or more generally when a small public exponent is used with a relatively large modulus (e.g., a public exponent of 17 with a 4096-bit modulus), an attacker can construct a signature which OpenSSL will accept as a valid PKCS#1 v1.5 signature.
Workaround No workaround is available.

Solution

Update the affected packages.

Plugin Details

Severity: Medium

ID: 23951

File Name: freebsd_pkg_077c2dca8f9a11dbab33000e0c2e438a.nasl

Version: 1.17

Type: local

Family: FreeBSD Local Security Checks

Published: 12/30/2006

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:openssl, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 12/19/2006

Vulnerability Publication Date: 9/6/2006

Reference Information

CVE: CVE-2006-4339

BID: 19849

CWE: 310

FreeBSD: SA-06:19.openssl

Detections

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