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CVE-2014-2653

Status Candidate

Overview

The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate.

Related Files

FreeBSD Security Advisory - OpenSSH Record Check
Posted Jul 28, 2015
Site security.freebsd.org

FreeBSD Security Advisory - OpenSSH clients does not correctly verify DNS SSHFP records when a server offers a certificate. OpenSSH servers which are configured to allow password authentication using PAM (default) would allow many password attempts.

tags | advisory
systems | freebsd
advisories | CVE-2014-2653, CVE-2015-5600
SHA-256 | 5a62702946b5a02f2793adee927547243f7fc23df83ae91a601fe9c2411fbd69
Mandriva Linux Security Advisory 2015-095
Posted Mar 30, 2015
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2015-095 - sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character. Matthew Vernon reported that if a SSH server offers a HostCertificate that the ssh client doesn't accept, then the client doesn't check the DNS for SSHFP records. As a consequence a malicious server can disable SSHFP-checking by presenting a certificate.

tags | advisory, remote
systems | linux, mandriva
advisories | CVE-2014-2532, CVE-2014-2653
SHA-256 | 704f97d77be07b02b98aa395298a8190003a67ae5101733fa1d6b66750ddbc2a
Red Hat Security Advisory 2015-0425-02
Posted Mar 5, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-0425-02 - OpenSSH is OpenBSD's SSH protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. It was discovered that OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. It was found that when OpenSSH was used in a Kerberos environment, remote authenticated users were allowed to log in as a different user if they were listed in the ~/.k5users file of that user, potentially bypassing intended authentication restrictions.

tags | advisory, remote, protocol
systems | linux, redhat, openbsd
advisories | CVE-2014-2653, CVE-2014-9278
SHA-256 | 041952d5e34f9d7f1d4d15be4b88d5cbba613b337cc3beadd90c531898fb5f99
HP Security Bulletin HPSBUX03188 SSRT101487 1
Posted Nov 12, 2014
Authored by HP | Site hp.com

HP Security Bulletin HPSBUX03188 SSRT101487 1 - Potential security vulnerabilities have been identified with HP-UX running HP Secure Shell. These vulnerabilities could be exploited remotely to create a Denial of Service (DoS) and other vulnerabilities. Revision 1 of this advisory.

tags | advisory, denial of service, shell, vulnerability
systems | hpux
advisories | CVE-2013-4548, CVE-2014-1692, CVE-2014-2532, CVE-2014-2653
SHA-256 | f48ab840d0de653a028d42f01133ffad6f77ec827e8549cb98d0a31ab37fa27c
Slackware Security Advisory - openssh Updates
Posted Oct 21, 2014
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix a security issue.

tags | advisory
systems | linux, slackware
advisories | CVE-2014-2653
SHA-256 | b02606af88649aabc62638536f007c27bce518275be821922d8d2ba68cb082df
Red Hat Security Advisory 2014-1552-02
Posted Oct 14, 2014
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2014-1552-02 - OpenSSH is OpenBSD's SSH protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. It was discovered that OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. A remote attacker could use this flaw to bypass intended environment variable restrictions.

tags | advisory, remote, protocol
systems | linux, redhat, openbsd
advisories | CVE-2014-2532, CVE-2014-2653
SHA-256 | fb95bead5faf7e3d2a1535309cf11df56a72ffbadce90698ce7cfccc3976f3a0
Mandriva Linux Security Advisory 2014-068
Posted Apr 9, 2014
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2014-068 - sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character. Matthew Vernon reported that if a SSH server offers a HostCertificate that the ssh client doesn't accept, then the client doesn't check the DNS for SSHFP records. As a consequence a malicious server can disable SSHFP-checking by presenting a certificate.

tags | advisory, remote
systems | linux, mandriva
advisories | CVE-2014-2532, CVE-2014-2653
SHA-256 | 0cf7a48470f92f54508eabbd4f9e1e0ae23f32cf46918fd1489cc6e856cf1a08
Ubuntu Security Notice USN-2164-1
Posted Apr 7, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2164-1 - Matthew Vernon discovered that OpenSSH did not correctly check SSHFP DNS records if a server presented an unacceptable host certificate. A malicious server could use this issue to disable SSHFP checking.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2014-2653
SHA-256 | 7b0f4e976b236236294b1d5252c077f746751ea14dd4ae1c72fe2805931b990f
Debian Security Advisory 2894-1
Posted Apr 7, 2014
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2894-1 - Two vulnerabilities were discovered in OpenSSH, an implementation of the SSH protocol suite.

tags | advisory, vulnerability, protocol
systems | linux, debian
advisories | CVE-2014-2532, CVE-2014-2653
SHA-256 | 5dba7d2302bdc35d448e8e95c5a203d4d00214d3bc18d6bf10df23d92a218c95
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