The remote host is running a version of Mac OS X that is 10.9.5 or 10.10.5 and is missing Security Update 2016-002. It is, therefore, affected by multiple vulnerabilities in the following components :

  - apache_mod_php
  - Kernel
  - libxml2
  - OpenSSH
  - Python
  - Tcl

Note that successful exploitation of the most serious issues can result in arbitrary code execution.

The Qualys Security team discovered two vulnerabilities in the roaming code of the OpenSSH client (an implementation of the SSH protocol suite).

SSH roaming enables a client, in case an SSH connection breaks unexpectedly, to resume it at a later time, provided the server also supports it.

The OpenSSH server doesn't support roaming, but the OpenSSH client supports it (even though it's not documented) and it's enabled by default.

CVE-2016-0777

An information leak (memory disclosure) can be exploited by a rogue SSH server to trick a client into leaking sensitive data from the client memory, including for example private keys.

CVE-2016-0778

A buffer overflow (leading to file descriptor leak), can also be exploited by a rogue SSH server, but due to another bug in the code is possibly not exploitable, and only under certain conditions (not the default configuration), when using ProxyCommand, ForwardAgent or ForwardX11.

This security update completely disables the roaming code in the OpenSSH client.

It is also possible to disable roaming by adding the (undocumented) option 'UseRoaming no' to the global /etc/ssh/ssh_config file, or to the user configuration in ~/.ssh/config, or by passing -oUseRoaming=no on the command line.

Users with passphrase-less privates keys, especially in non interactive setups (automated jobs using ssh, scp, rsync+ssh etc.) are advised to update their keys if they have connected to an SSH server they don't trust.

More details about identifying an attack and mitigations can be found in the Qualys Security Advisory.

  - -- Yves-Alexis Perez

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The Qualys Security team discovered two vulnerabilities in the roaming code of the OpenSSH client (an implementation of the SSH protocol suite).

SSH roaming enables a client, in case an SSH connection breaks unexpectedly, to resume it at a later time, provided the server also supports it.

The OpenSSH server doesn't support roaming, but the OpenSSH client supports it (even though it's not documented) and it's enabled by default.

  - CVE-2016-0777     An information leak (memory disclosure) can be exploited     by a rogue SSH server to trick a client into leaking     sensitive data from the client memory, including for     example private keys.

  - CVE-2016-0778     A buffer overflow (leading to file descriptor leak), can     also be exploited by a rogue SSH server, but due to     another bug in the code is possibly not exploitable, and     only under certain conditions (not the default     configuration), when using ProxyCommand, ForwardAgent or     ForwardX11.

This security update completely disables the roaming code in the OpenSSH client.

It is also possible to disable roaming by adding the (undocumented) option 'UseRoaming no' to the global /etc/ssh/ssh_config file, or to the user configuration in ~/.ssh/config, or by passing -oUseRoaming=no on the command line.

Users with passphrase-less private keys, especially in non interactive setups (automated jobs using ssh, scp, rsync+ssh etc.) are advised to update their keys if they have connected to an SSH server they don't trust.

More details about identifying an attack and mitigations will be available in the Qualys Security Advisory.

OpenSSH reports :

OpenSSH clients between versions 5.4 and 7.1 are vulnerable to information disclosure that may allow a malicious server to retrieve information including under some circumstances, user's private keys.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-0043 advisory.

    [6.6.1p1-23 + 0.9.3-9]
    - Disable undocumented feauture Roaming for good (#1298218)
    - prevents CVE-2016-0777 and CVE-2016-0778

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
90097	Mac OS X 10.9.5 / 10.10.5 Multiple Vulnerabilities (Security Update 2016-002)	Nessus	MacOS X Local Security Checks	2016/3/22	2024/5/28	critical
87933	Debian DLA-387-1 : openssh security update	Nessus	Debian Local Security Checks	2016/1/15	2021/1/11	high
87934	Debian DSA-3446-1 : openssh - security update	Nessus	Debian Local Security Checks	2016/1/15	2021/1/11	high
87935	FreeBSD : openssh -- information disclosure (dfe0cdc1-baf2-11e5-863a-b499baebfeaf)	Nessus	FreeBSD Local Security Checks	2016/1/15	2021/1/4	high
87936	Oracle Linux 7 : openssh (ELSA-2016-0043)	Nessus	Oracle Linux Local Security Checks	2016/1/15	2025/2/18	critical

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