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5 more Windows admin tasks made easy with PowerShell

Credit to Author: Jonathan Hassell| Date: Wed, 13 Dec 2017 03:00:00 -0800

I’ve written a lot about Microsoft PowerShell on this site, but my favorite thing to do is show how to apply the scripting language to various tasks you already have to do as part of your regular role and responsibilities. In a previous article, I demonstrated how to accomplish five common administrative tasks using PowerShell.

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IndependentKrebs
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Patch Tuesday, December 2017 Edition

Credit to Author: BrianKrebs| Date: Tue, 12 Dec 2017 20:57:23 +0000

The final Patch Tuesday of the year is upon us, with Adobe and Microsoft each issuing security updates for their software once again. Redmond fixed problems with various flavors of Windows, Microsoft Edge, Office, Exchange and its Malware Protection Engine. And of course Adobe’s got another security update available for its Flash Player software.

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IndependentSecuriteam
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SSD Advisory – QNAP QTS Unauthenticated Remote Code Execution

Credit to Author: SSD / Maor Schwartz| Date: Mon, 11 Dec 2017 10:16:42 +0000

Vulnerability Summary The following advisory describes a memory corruption vulnerability that can lead to an unauthenticated remote code execution in QNAP QTS versions 4.3.x and 4.2.x, including the 4.3.3.0299. QNAP Systems, Inc. is “a Taiwanese corporation that specializes in providing networked solutions for file sharing, virtualization, storage management and surveillance applications to address corporate, SMB, … Continue reading SSD Advisory – QNAP QTS Unauthenticated Remote Code Execution

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IndependentSecuriteam
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SSD安全公告-Endian防火墙从存储型XSS到远程命令执行

Credit to Author: SSD / Maor Schwartz| Date: Mon, 11 Dec 2017 09:17:06 +0000

漏洞概要 以下安全公告描述了在Endian防火墙5.0.3版本中存在的一个存储型XSS漏洞，成功利用该漏洞可造成远程代码执行。 Endian防火墙是一个“专注Linux安全的发行版本,，它是一个独立的，统一的安全管理操作系统。 Endian防火墙基于强化的Linux操作系统。” 漏洞提交者 一位独立的安全研究者向 Beyond Security 的 SSD 报告了该漏洞 厂商响应 厂商已经发布针对该漏洞的补丁。获取更多信息: https://help.endian.com/hc/en-us/articles/115012996087 漏洞详细信息 Endian防火墙是基于Linux的防火墙/网关。 它使用不同的颜色来标记其trusted，untrusted 和DMZ网络： 绿色 – trusted网络 红色 – untrusted 网络 橙色 – DMZ 蓝色 – WiFi 用户可控的输入没有经过充分过滤，通过从untrusted 网络（红色）发送电子邮件到DMZ上的邮件服务器（橙色），Endian防火墙会把来自untrusted 网络的电子邮件隔离。 当来自trusted网络（绿色）的用户登录到Endian Firewall WebAdmin并检查隔离区中的电子邮件（Services > Mail Quarantine > quarantine）时，会执行存储型XSS脚本。 漏洞证明 配置环境 安装Endian防火墙虚拟机并设置防火墙网络接口为以下IP： 绿色 – 192.168.0.190 红色 – 192.168.0.192 设置以下密码： Web管理员（admin/Password1） SSH管理员（root/Password1） 连接Webadmin接口，添加ORANGE网络并更改GREEN … Continue reading SSD安全公告-Endian防火墙从存储型XSS到远程命令执行

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IndependentSecuriteam
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SSD安全公告-Linux内核XFRM权限提升漏洞

Credit to Author: SSD / Maor Schwartz| Date: Mon, 11 Dec 2017 08:51:42 +0000

漏洞概要 以下安全公告描述了在Linux内核中发现的一个UAF漏洞，成功利用此漏洞的攻击者可以提升权限。漏洞存在于Netlink 套接字子系统 – XFRM. Netlink用于在内核和用户空间进程之间传输信息。 它由用户空间进程的标准基于套接字的接口和内核模块的内部内核API组成。 漏洞提交者 一位独立的安全研究员Mohamed Ghannam向Beyond Security的SSD报告了该漏洞 厂商响应 该漏洞已在补丁1137b5e中被修复（“ipsec：修复中止xfrm策略转储崩溃”） CVE: CVE-2017-16939 [crayon-5a2f0459e8bcf346519844/] 漏洞详细信息 非特权用户可以更改Netlink 套接字子系统 XFRM sk-> sk_rcvbuf的值（sk ==sock结构体对象）。 可以通过setsockopt（SO_RCVBUF）更改sk-> sk_rcvbuf的值为特定的范围。通过recvmsg/recv/read接收数据时，sk_rcvbuf表示接收缓冲区的大小。 sk_rcvbuf值是内核为skb（sk_buff结构体对象）分配的大小。 skb-> trusize是一个变量，它保持对已使用内存的追踪，为了避免内存浪费，方便管理，内核可以在运行时改变skb的大小。 例如，如果我们分配一个大的套接字缓冲区（skb），而我们只接收到1字节大小的数据包，内核将通过调用skb_set_owner_r来调整skb-> trusize的大小。 通过调用skb_set_owner_r修改sk-> sk_rmem_alloc（引用自原子变量sk-> sk_backlog.rmem_alloc）。 当创建XFRM netlink 套接字时，会调用xfrm_dump_policy函数，当我们关闭套接字时，xfrm_dump_policy_done会被调用。 当netlink_sock对象的cb_running值为true时调用xfrm_dump_policy_done。 xfrm_dump_policy_done会尝试清理由netlink_callback对象管理的xfrm walk条目。 当调用netlink_skb_set_owner_r（如skb_set_owner_r）时，它会更新sk_rmem_alloc。 netlink_dump(): 在上面的代码中，我们可以看到当sk-> sk_rcvbuf小于sk_rmem_alloc（注意我们可以通过stockpot控制sk-> sk_rcvbuf）时，netlink_dump()验证失败。 当满足sk-> sk_rcvbuf小于sk_rmem_alloc时，会跳转到函数的结尾，然而cb_running的值还没有被更改为false，netlink_dump()函数就返回了。 此时nlk-> cb_running为true，因此会调用xfrm_dump_policy_done()。 nlk-> cb.done指向xfrm_dump_policy_done，值得注意的是这个函数处理一个双向链表，所以如果利用这个漏洞引用一个可控的缓冲区，我们就可以实现任意内存读写。 漏洞证明 下面的代码在Ubuntu 17.04测试。 [crayon-5a2f0459e8bd9379864677/]

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ComputerWorldIndependent
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It's time: Make sure Windows Auto Update is turned off

Credit to Author: Woody Leonhard| Date: Mon, 11 Dec 2017 03:44:00 -0800

It’s time to make sure your computer is locked down. If history is any indication, we’re going to be in for a rocky ride over the next week or two.

In September, folks who were set to update Windows automatically were greeted by Word docs and Excel spreadsheets that wouldn’t display merged cells, switched languages and intentionally broke one-click printing on custom forms. In October, admins who let patches go through automatically were greeted by oceans of blue screens and failures in Microsoft’s own Dynamics CRM. Last month, every version of Windows was hit with a patching bug that blocked Epson dot matrix printers — and those who had told Win10 Creators Update to wait to upgrade found themselves “accidentally” upgraded to Win10 Fall Creators Update, version 1709.

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ComputerWorldIndependent
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Microsoft quietly repairs Windows Defender security hole CVE-2017-11937

Credit to Author: Woody Leonhard| Date: Fri, 08 Dec 2017 07:23:00 -0800

Many malware researchers were surprised to find an unexpected patch on their machines yesterday. It didn’t arrive through the front door — Windows Update wasn’t involved. Instead, the new version of mpengine.dll arrived automatically, around the back, even if you have Windows Update turned off.

This vulnerability is particularly nasty. If the Malware Protection Engine scans a jimmied file, the file can take over your computer and run whatever it wants. Since the MPE routinely runs all the time, in the background, that means a bad file could infect your computer in myriad ways. To quote Microsoft’s Security Vulnerability notice:

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