Vulnerabilities > CVE-2015-0534 - Improper Certificate Validation vulnerability in Dell Bsafe, Bsafe Ssl-C and Bsafe Ssl-J

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
PARTIAL
Availability impact
NONE
network
low complexity
dell
CWE-295

Summary

EMC RSA BSAFE Micro Edition Suite (MES) 4.0.x before 4.0.8 and 4.1.x before 4.1.3, RSA BSAFE Crypto-J before 6.2, RSA BSAFE SSL-J before 6.2, and RSA BSAFE SSL-C 2.8.9 and earlier do not enforce certain constraints on certificate data, which allows remote attackers to defeat a fingerprint-based certificate-blacklist protection mechanism by including crafted data within a certificate's unsigned portion, a similar issue to CVE-2014-8275.

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Creating a Rogue Certificate Authority Certificate
    An attacker exploits a weakness in the MD5 hash algorithm (weak collision resistance) to generate a certificate signing request (CSR) that contains collision blocks in the "to be signed" part. The attacker specially crafts two different, but valid X.509 certificates that when hashed with the MD5 algorithm would yield the same value. The attacker then sends the CSR for one of the certificates to the Certification Authority which uses the MD5 hashing algorithm. That request is completely valid and the Certificate Authority issues an X.509 certificate to the attacker which is signed with its private key. An attacker then takes that signed blob and inserts it into another X.509 certificate that the attacker generated. Due to the MD5 collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the attackers' second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority. To make the attack more interesting, the second certificate could be not just a regular certificate, but rather itself a signing certificate. Thus the attacker is able to start their own Certification Authority that is anchored in its root of trust in the legitimate Certification Authority that has signed the attackers' first X.509 certificate. If the original Certificate Authority was accepted by default by browsers, so will now the Certificate Authority set up by the attacker and of course any certificates that it signs. So the attacker is now able to generate any SSL certificates to impersonate any web server, and the user's browser will not issue any warning to the victim. This can be used to compromise HTTPS communications and other types of systems where PKI and X.509 certificates may be used (e.g., VPN, IPSec) .

Seebug

bulletinFamilyexploit
description受影响的产品: RSA BSAFE Micro Edition Suite (MES) all 4.1.x versions prior to 4.1.3 RSA BSAFE Micro Edition Suite (MES) all 4.0.x versions prior to 4.0.8 RSA BSAFE Crypto-C Micro Edition (Crypto-C ME) 4.1 RSA BSAFE Crypto-C Micro Edition (Crypto-C ME) all versions prior to 4.0.4 RSA BSAFE Crypto-J all versions prior to 6.2 RSA BSAFE SSL-J all versions prior to 6.2 RSA BSAFE SSL-C all versions including 2.8.9 未受影响的产品: RSA BSAFE Micro Edition Suite (MES) 4.1.3 RSA BSAFE Micro Edition Suite (MES) 4.0.8 RSA BSAFE Crypto-C Micro Edition (Crypto-C ME) 4.0.4 RSA BSAFE Crypto-J 6.2 RSA BSAFE SSL-J 6.2 漏洞原因:Base64解码实现的整数下溢 在RSA BSAFE MES,Crypto-C ME和SSL-C中的Base64解码实现时的整数下溢可能允许远程攻击者通过分段报错导致内存意外损坏(类似于CVE-2015-导致拒绝服务0292)。 CVSS V2基本评分:7.5(AV:N / AC:L /金:N / C:P / I:P / A:P) 注:影响MES,上面列出的Crypto-C ME和SSL-C版本。 建议: RSA BSAFE Micro Edition Suite (MES) 4.0.8 and 4.1.3 修复了 CVE-2015-0533, CVE-2015-0534, CVE-2015-0535, CVE-2015-0536, CVE-2015-0537 RSA BSAFE Crypto-C Micro Edition (Crypto-C ME) 4.0.4 修复了 CVE-2015-0537. RSA BSAFE Crypto-J 6.2 修复了 CVE-2015-0534 RSA BSAFE SSL-J 6.2 修复了 CVE-2015-0534 RSA建议所有客户升级到尽早上面列出的版本。
idSSV:89264
last seen2017-11-19
modified2015-08-31
published2015-08-31
reporteravengert
titleMultiple EMC RSA Products ESA-2015-081 Multiple Security Vulnerabilities