Updated openssh packages fixes security vulnerabilities :

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 (CVE-2014-2532).

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 (CVE-2014-2653).

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:1552 advisory.

    OpenSSH is OpenBSD's SSH (Secure Shell) 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. (CVE-2014-2653)

    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. (CVE-2014-2532)

    This update also fixes the following bugs:

    * Based on the SP800-131A information security standard, the generation of     a digital signature using the Digital Signature Algorithm (DSA) with the     key size of 1024 bits and RSA with the key size of less than 2048 bits is     disallowed after the year 2013. After this update, ssh-keygen no longer     generates keys with less than 2048 bits in FIPS mode. However, the sshd     service accepts keys of size 1024 bits as well as larger keys for     compatibility reasons. (BZ#993580)

    * Previously, the openssh utility incorrectly set the oom_adj value to -17     for all of its children processes. This behavior was incorrect because the     children processes were supposed to have this value set to 0. This update     applies a patch to fix this bug and oom_adj is now properly set to 0 for     all children processes as expected. (BZ#1010429)

    * Previously, if the sshd service failed to verify the checksum of an     installed FIPS module using the fipscheck library, the information about     this failure was only provided at the standard error output of sshd. As a     consequence, the user could not notice this message and be uninformed when     a system had not been properly configured for FIPS mode. To fix this bug,     this behavior has been changed and sshd now sends such messages via the     syslog service. (BZ#1020803)

    * When keys provided by the pkcs11 library were removed from the ssh agent     using the ssh-add -e command, the user was prompted to enter a PIN.
    With this update, a patch has been applied to allow the user to remove the     keys provided by pkcs11 without the PIN. (BZ#1042519)

    In addition, this update adds the following enhancements:

    * With this update, ControlPersist has been added to OpenSSH. The option in     conjunction with the ControlMaster configuration directive specifies that     the master connection remains open in the background after the initial     client connection has been closed. (BZ#953088)

    * When the sshd daemon is configured to force the internal SFTP session,     and the user attempts to use a connection other than SFTP, the appropriate     message is logged to the /var/log/secure file. (BZ#997377)

    * Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and     host user keys (ECDSA) as specified by RFC5656 has been added to the     openssh packages. However, they are not enabled by default and the user has     to enable them manually. For more information on how to configure ECDSA and     ECDH with OpenSSH, see: https://access.redhat.com/solutions/711953     (BZ#1028335)

    All openssh users are advised to upgrade to these updated packages, which     contain backported patches to correct these issues and add these     enhancements.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-0425 advisory.

    - add new option GSSAPIEnablek5users and disable using ~/.k5users by default CVE-2014-9278       (#1169843)
    - prevent a server from skipping SSHFP lookup - CVE-2014-2653 (#1081338)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Updated openssh packages fix security vulnerabilities :

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 (CVE-2014-2532).

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 (CVE-2014-2653).

The remote NewStart CGSL host, running version MAIN 6.06 (SP), has openssh packages installed that are affected by multiple vulnerabilities:

  - The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and     relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a     fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11     server, as demonstrated by lack of the SECURITY extension on this X11 server. (CVE-2016-1908)

  - Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service     (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors     that lead to a double-free. (CVE-2006-5051)

  - scp in OpenSSH 4.2p1 allows attackers to execute arbitrary commands via filenames that contain shell     metacharacters or spaces, which are expanded twice. (CVE-2006-0225)

  - sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a     denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not     properly handled by the CRC compensation attack detector. (CVE-2006-4924)

  - Unspecified vulnerability in the sshd Privilege Separation Monitor in OpenSSH before 4.5 causes weaker     verification that authentication has been successful, which might allow attackers to bypass     authentication. NOTE: as of 20061108, it is believed that this issue is only exploitable by leveraging     vulnerabilities in the unprivileged process, which are not known to exist. (CVE-2006-5794)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 6.06, has openssh packages installed that are affected by multiple vulnerabilities:

  - The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and     relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a     fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11     server, as demonstrated by lack of the SECURITY extension on this X11 server. (CVE-2016-1908)

  - Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service     (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors     that lead to a double-free. (CVE-2006-5051)

  - scp in OpenSSH 4.2p1 allows attackers to execute arbitrary commands via filenames that contain shell     metacharacters or spaces, which are expanded twice. (CVE-2006-0225)

  - sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a     denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not     properly handled by the CRC compensation attack detector. (CVE-2006-4924)

  - Unspecified vulnerability in the sshd Privilege Separation Monitor in OpenSSH before 4.5 causes weaker     verification that authentication has been successful, which might allow attackers to bypass     authentication. NOTE: as of 20061108, it is believed that this issue is only exploitable by leveraging     vulnerabilities in the unprivileged process, which are not known to exist. (CVE-2006-5794)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
73444	Mandriva Linux Security Advisory : openssh (MDVSA-2014:068)	Nessus	Mandriva Local Security Checks	2014/4/10	2021/1/6	medium
78413	RHEL 6 : openssh (RHSA-2014:1552)	Nessus	Red Hat Local Security Checks	2014/10/14	2025/2/18	medium
81725	Oracle Linux 7 : openssh (ELSA-2015-0425)	Nessus	Oracle Linux Local Security Checks	2015/3/10	2024/10/22	critical
82348	Mandriva Linux Security Advisory : openssh (MDVSA-2015:095)	Nessus	Mandriva Local Security Checks	2015/3/30	2021/1/14	medium
301236	NewStart CGSL MAIN 6.06 (SP) : openssh Multiple Vulnerabilities (NS-SA-2026-0003)	Nessus	NewStart CGSL Local Security Checks	2026/3/6	2026/3/6	critical
266250	NewStart CGSL MAIN 6.06 : openssh Multiple Vulnerabilities (NS-SA-2025-0210)	Nessus	NewStart CGSL Local Security Checks	2025/9/30	2025/9/30	critical

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