ID CVE-2005-2946
Summary The default configuration on OpenSSL before 0.9.8 uses MD5 for creating message digests instead of a more cryptographically strong algorithm, which makes it easier for remote attackers to forge certificates with a valid certificate authority signature.
References
Vulnerable Configurations
  • OpenSSL Project OpenSSL 0.9.1c
    cpe:2.3:a:openssl:openssl:0.9.1c
  • OpenSSL Project OpenSSL 0.9.2b
    cpe:2.3:a:openssl:openssl:0.9.2b
  • OpenSSL Project OpenSSL 0.9.3
    cpe:2.3:a:openssl:openssl:0.9.3
  • OpenSSL Project OpenSSL 0.9.3a
    cpe:2.3:a:openssl:openssl:0.9.3a
  • OpenSSL Project OpenSSL 0.9.4
    cpe:2.3:a:openssl:openssl:0.9.4
  • OpenSSL Project OpenSSL 0.9.5
    cpe:2.3:a:openssl:openssl:0.9.5
  • OpenSSL Project OpenSSL 0.9.5 Beta1
    cpe:2.3:a:openssl:openssl:0.9.5:beta1
  • OpenSSL Project OpenSSL 0.9.5 Beta2
    cpe:2.3:a:openssl:openssl:0.9.5:beta2
  • OpenSSL Project OpenSSL 0.9.5a
    cpe:2.3:a:openssl:openssl:0.9.5a
  • OpenSSL Project OpenSSL 0.9.5a Beta1
    cpe:2.3:a:openssl:openssl:0.9.5a:beta1
  • OpenSSL Project OpenSSL 0.9.5a Beta2
    cpe:2.3:a:openssl:openssl:0.9.5a:beta2
  • OpenSSL Project OpenSSL 0.9.6
    cpe:2.3:a:openssl:openssl:0.9.6
  • OpenSSL Project OpenSSL 0.9.6 Beta1
    cpe:2.3:a:openssl:openssl:0.9.6:beta1
  • OpenSSL Project OpenSSL 0.9.6 Beta2
    cpe:2.3:a:openssl:openssl:0.9.6:beta2
  • OpenSSL Project OpenSSL 0.9.6 Beta3
    cpe:2.3:a:openssl:openssl:0.9.6:beta3
  • OpenSSL Project OpenSSL 0.9.6a
    cpe:2.3:a:openssl:openssl:0.9.6a
  • OpenSSL Project OpenSSL 0.9.6a Beta1
    cpe:2.3:a:openssl:openssl:0.9.6a:beta1
  • OpenSSL Project OpenSSL 0.9.6a Beta2
    cpe:2.3:a:openssl:openssl:0.9.6a:beta2
  • OpenSSL Project OpenSSL 0.9.6a Beta3
    cpe:2.3:a:openssl:openssl:0.9.6a:beta3
  • OpenSSL Project OpenSSL 0.9.6b
    cpe:2.3:a:openssl:openssl:0.9.6b
  • OpenSSL Project OpenSSL 0.9.6c
    cpe:2.3:a:openssl:openssl:0.9.6c
  • OpenSSL Project OpenSSL 0.9.6d
    cpe:2.3:a:openssl:openssl:0.9.6d
  • OpenSSL Project OpenSSL 0.9.6e
    cpe:2.3:a:openssl:openssl:0.9.6e
  • OpenSSL Project OpenSSL 0.9.6f
    cpe:2.3:a:openssl:openssl:0.9.6f
  • OpenSSL Project OpenSSL 0.9.6g
    cpe:2.3:a:openssl:openssl:0.9.6g
  • OpenSSL Project OpenSSL 0.9.6h
    cpe:2.3:a:openssl:openssl:0.9.6h
  • OpenSSL Project OpenSSL 0.9.6i
    cpe:2.3:a:openssl:openssl:0.9.6i
  • OpenSSL Project OpenSSL 0.9.6j
    cpe:2.3:a:openssl:openssl:0.9.6j
  • OpenSSL Project OpenSSL 0.9.6k
    cpe:2.3:a:openssl:openssl:0.9.6k
  • OpenSSL Project OpenSSL 0.9.6l
    cpe:2.3:a:openssl:openssl:0.9.6l
  • OpenSSL Project OpenSSL 0.9.6m
    cpe:2.3:a:openssl:openssl:0.9.6m
  • OpenSSL Project OpenSSL 0.9.7
    cpe:2.3:a:openssl:openssl:0.9.7
  • OpenSSL Project OpenSSL 0.9.7 beta1
    cpe:2.3:a:openssl:openssl:0.9.7:beta1
  • OpenSSL Project OpenSSL 0.9.7 beta2
    cpe:2.3:a:openssl:openssl:0.9.7:beta2
  • OpenSSL Project OpenSSL 0.9.7 beta3
    cpe:2.3:a:openssl:openssl:0.9.7:beta3
  • OpenSSL Project OpenSSL 0.9.7 Beta4
    cpe:2.3:a:openssl:openssl:0.9.7:beta4
  • OpenSSL Project OpenSSL 0.9.7 Beta5
    cpe:2.3:a:openssl:openssl:0.9.7:beta5
  • OpenSSL Project OpenSSL 0.9.7 Beta6
    cpe:2.3:a:openssl:openssl:0.9.7:beta6
  • OpenSSL Project OpenSSL 0.9.7a
    cpe:2.3:a:openssl:openssl:0.9.7a
  • OpenSSL Project OpenSSL 0.9.7b
    cpe:2.3:a:openssl:openssl:0.9.7b
  • OpenSSL Project OpenSSL 0.9.7c
    cpe:2.3:a:openssl:openssl:0.9.7c
  • OpenSSL Project OpenSSL 0.9.7d
    cpe:2.3:a:openssl:openssl:0.9.7d
  • OpenSSL Project OpenSSL 0.9.7e
    cpe:2.3:a:openssl:openssl:0.9.7e
  • OpenSSL Project OpenSSL 0.9.7f
    cpe:2.3:a:openssl:openssl:0.9.7f
  • OpenSSL Project OpenSSL 0.9.7g
    cpe:2.3:a:openssl:openssl:0.9.7g
CVSS
Base: 5.0 (as of 16-09-2005 - 20:46)
Impact:
Exploitability:
CWE CWE-310
CAPEC
  • Signature Spoofing by Key Recreation
    An attacker obtains an authoritative or reputable signer's private signature key by exploiting a cryptographic weakness in the signature algorithm or pseudorandom number generation and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE PARTIAL NONE
nessus via4
  • NASL family Web Servers
    NASL id OPENSSL_0_9_8.NASL
    description According to its banner, the remote server is running a version of OpenSSL that is earlier than 0.9.8. The default configuration uses MD5 instead of a stronger hash algorithm. An attacker could forge certificates. If you never generate certificates on this machine, you may ignore this warning.
    last seen 2019-02-21
    modified 2018-11-15
    plugin id 17759
    published 2012-01-04
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=17759
    title OpenSSL < 0.9.8 Weak Default Configuration
  • NASL family Mandriva Local Security Checks
    NASL id MANDRAKE_MDKSA-2005-179.NASL
    description Yutaka Oiwa discovered vulnerability potentially affects applications that use the SSL/TLS server implementation provided by OpenSSL. Such applications are affected if they use the option SSL_OP_MSIE_SSLV2_RSA_PADDING. This option is implied by use of SSL_OP_ALL, which is intended to work around various bugs in third- party software that might prevent interoperability. The SSL_OP_MSIE_SSLV2_RSA_PADDING option disables a verification step in the SSL 2.0 server supposed to prevent active protocol-version rollback attacks. With this verification step disabled, an attacker acting as a 'man in the middle' can force a client and a server to negotiate the SSL 2.0 protocol even if these parties both support SSL 3.0 or TLS 1.0. The SSL 2.0 protocol is known to have severe cryptographic weaknesses and is supported as a fallback only. (CVE-2005-2969) The current default algorithm for creating 'message digests' (electronic signatures) for certificates created by openssl is MD5. However, this algorithm is not deemed secure any more, and some practical attacks have been demonstrated which could allow an attacker to forge certificates with a valid certification authority signature even if he does not know the secret CA signing key. To address this issue, openssl has been changed to use SHA-1 by default. This is a more appropriate default algorithm for the majority of use cases. If you still want to use MD5 as default, you can revert this change by changing the two instances of 'default_md = sha1' to 'default_md = md5' in /usr/{lib,lib64}/ssl/openssl.cnf. (CVE-2005-2946)
    last seen 2019-02-21
    modified 2018-07-19
    plugin id 20039
    published 2005-10-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=20039
    title Mandrake Linux Security Advisory : openssl (MDKSA-2005:179)
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-179-1.NASL
    description The current default algorithm for creating 'message digests' (electronic signatures) for certificates created by openssl is MD5. However, this algorithm is not deemed secure any more, and some practical attacks have been demonstrated which could allow an attacker to forge certificates with a valid certification authority signature even if he does not know the secret CA signing key. Therefore all Ubuntu versions of openssl have now been changed to use SHA-1 by default. This is a more appropriate default algorithm for the majority of use cases; however, if you still want to use MD5 as default, you can revert this change by changing the two instances of 'default_md = sha1' to 'default_md = md5' in /etc/ssl/openssl.cnf. A detailed explanation and further links can be found at http://www.cits.rub.de/MD5Collisions/ Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-08-03
    plugin id 20589
    published 2006-01-15
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=20589
    title Ubuntu 4.10 / 5.04 : openssl weak default configuration (USN-179-1)
refmap via4
misc
ubuntu USN-179-1
statements via4
contributor Joshua Bressers
lastmodified 2006-09-20
organization Red Hat
statement Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169803 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw. More information regarding issue severity can be found here: http://www.redhat.com/security/updates/classification/
Last major update 07-01-2009 - 00:00
Published 16-09-2005 - 18:03
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