Savitech (盛微) 的 USB 音效驅動程式會安裝 Root CA (被發了 CVE-2017-9758)

Hacker News 上看到 CERT 的「Savitech USB audio drivers install a new root CA certificate」提到 Savitech USB audio driver 會安裝自己的 Root CA:

Savitech provides USB audio drivers for a number of specialized audio products. Some versions of the Savitech driver package silently install a root CA certificate into the Windows trusted root certificate store.

出自「Inaudible Subversion - Did your Hi-Fi just subvert your PC? (原網站已經無法訪問,參考備份連結 https://archive.is/K6REr)」,CVE 編號是 CVE-2017-9758,最初是由 n3kt0n 提出的:「某單位 drivers silently install certificate in trusted root certificate authorities store [CVE-2017-9758]」:

Mitre assigned this exposure the identifier CVE-2017-9758, but was initially tracked by HITCON ZeroDay project as ZD-2017-00386.

有兩把 CA public key 被塞進去。雖然目前還沒有徵兆 private key 有外洩,但還是建議儘快移除:

There is currently no evidence that the Savitech private key is compromised. However, users are encouraged to remove the certificate out of caution. The two known certificates are:

SaviAudio root certificate #1
‎Validity: Thursday, ‎May ‎31, ‎2012 - ‎Tuesday, ‎December ‎30, ‎2036
Serial number: 579885da6f791eb24de819bb2c0eeff0
Thumbprint: cb34ebad73791c1399cb62bda51c91072ac5b050

SaviAudio root certificate #2
Validity: ‎Thursday, ‎December ‎31, ‎2015 - ‎Tuesday, ‎December ‎30, ‎2036
Serial number: ‎972ed9bce72451bb4bd78bfc0d8b343c
Thumbprint: 23e50cd42214d6252d65052c2a1a591173daace5

另外 Savitech 也放出了新版的 driver,不包含 Root CA:

Savitech has released a new driver package to address the issue. Savitech drivers version 2.8.0.3 or later do not install the root CA certificate. Users still must remove any previously installed certificate manually.

看了一下說明,看起來是當時為了支援 Windows XP 而做的,但微軟已經不提供驅動程式的數位簽章了,所以就只好這樣搞...

Node.js 安全性更新:zlib...

前幾天「Node.js 預定在十月 24 號發表安全性更新」提到 Node.js 會發表安全性更新,已經看到 4/6/8 都出新版了:「Node v4.8.5 (Maintenance)」、「Node v6.11.5 (LTS)」、「Node v8.8.0 (Current)」。

這次安全更新的 CVECVE-2017-14919

CVE-2017-14919 - In zlib v1.2.9, a change was made that causes an error to be raised when a raw deflate stream is initialized with windowBits set to 8. On some versions this crashes Node and you cannot recover from it, while on some versions it throws an exception. Node.js will now gracefully set windowBits to 9 replicating the legacy behavior to avoid a DOS vector. nodejs-private/node-private#95

zlib 的 manualwindowBits 說明:

For the current implementation of deflate(), a windowBits value of 8 (a window size of 256 bytes) is not supported. As a result, a request for 8 will result in 9 (a 512-byte window). In that case, providing 8 to inflateInit2() will result in an error when the zlib header with 9 is checked against the initialization of inflate(). The remedy is to not use 8 with deflateInit2() with this initialization, or at least in that case use 9 with inflateInit2().

唔?XD

另外文章可以看出來 Node.js 團隊是選擇在 GitHub 上用另外一個 organization 在管這類不會事前公開的事情...

Dnsmasq 的安全性漏洞

Google 這次出手炸的好痛:「Behind the Masq: Yet more DNS, and DHCP, vulnerabilities」。

當需要在 client 端處理 DNS 的事情,有蠻多開發者都會選擇用 Dnsmasq 處理,這次直接拉出七個 CVE (編號 CVE-2017-13704 與 CVE-2016-{14491-14496}),其中三個是 RCE:

看了一下,Ubuntu 也推出更新了,接下來有一堆機器要升級 Dnsmasq... :o

Apache 的 Optionsbleed

Apache 也出了類似 Heartbleed 的包:「Apache bug leaks contents of server memory for all to see—Patch now」,原文出自「Optionsbleed - HTTP OPTIONS method can leak Apache's server memory」。

這掛上 CVE-2017-9798 了,影響版本包括了:

This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27.

發生在對 OPTIONS 處理出問題:

Optionsbleed is a use after free error in Apache HTTP that causes a corrupted Allow header to be constructed in response to HTTP OPTIONS requests. This can leak pieces of arbitrary memory from the server process that may contain secrets. The memory pieces change after multiple requests, so for a vulnerable host an arbitrary number of memory chunks can be leaked.

就... 更新吧 @_@

在 Git/Mercurial/Subversion 上 "-" 發生的問題

在「[ANNOUNCE] Git v2.14.1, v2.13.5, and others」這邊看到 - 開頭產生的問題:

These contain a security fix for CVE-2017-1000117, and are released in coordination with Subversion and Mercurial that share a similar issue. CVE-2017-9800 and CVE-2017-1000116 are assigned to these systems, respectively, for issues similar to it that are now addressed in their part of this coordinated release.

這算是老問題了,Git 對應的修正主要是朝 filter input 的方向修正,包括了禁用 - 開頭的 hostname,以及禁止 GIT_PROXY_COMMAND- 開頭,另外是禁止開頭是 - 的 repository name:

  • A "ssh://..." URL can result in a "ssh" command line with a hostname that begins with a dash "-", which would cause the "ssh" command to instead (mis)treat it as an option. This is now prevented by forbidding such a hostname (which should not impact any real-world usage).
  • Similarly, when GIT_PROXY_COMMAND is configured, the command is run with host and port that are parsed out from "ssh://..." URL; a poorly written GIT_PROXY_COMMAND could be tricked into treating a string that begins with a dash "-" as an option. This is now prevented by forbidding such a hostname and port number (again, which should not impact any real-world usage).
  • In the same spirit, a repository name that begins with a dash "-" is also forbidden now.

然後中華電信的 DNS server (168.95.1.1 & 168.95.192.1) 都查不到 marc.info,改用 Google 的 8.8.8.8 才查得到... =_=

最近 OpenVPN 的安全性漏洞...

看到「The OpenVPN post-audit bug bonanza」這個只有苦笑啊...

作者在 OpenVPN 經過一連串的安全加強後 (包括 harden 計畫與兩個外部單位的程式碼稽核找到不少問題),決定出手挖看看:

After a hardening of the OpenVPN code (as commissioned by the Dutch intelligence service AIVD) and two recent audits 1 2, I thought it was now time for some real action ;).

然後就挖出不少問題了...

可以看到作者透過 fuzzing 打出一卡車,包含了不少 crash XDDD:(然後有一個是 stack buffer corruption,不知道有沒有機會變成 RCE)

  • Remote server crashes/double-free/memory leaks in certificate processing (CVE-2017-7521)
  • Remote (including MITM) client crash, data leak (CVE-2017-7520)
  • Remote (including MITM) client stack buffer corruption
  • Remote server crash (forced assertion failure) (CVE-2017-7508)
  • Crash mbed TLS/PolarSSL-based server (CVE-2017-7522)
  • Stack buffer overflow if long –tls-cipher is given

iOS 透過無線網路的 RCE...

在「About the security content of iOS 10.3.1」這邊的說明:

Available for: iPhone 5 and later, iPad 4th generation and later, iPod touch 6th generation and later
Impact: An attacker within range may be able to execute arbitrary code on the Wi-Fi chip
Description: A stack buffer overflow was addressed through improved input validation.
CVE-2017-6975: Gal Beniamini of Google Project Zero

這描述看起來就不太妙...

分析現在還有多少不安全的 JavaScript Library 被使用

在「Thou shalt not depend on me: analysing the use of outdated JavaScript libraries on the web」這邊看到對 JavaScript Library 的研究。

jQuery 沒有什麼疑問的還是最大宗,查了一下應該是 CVE-2011-4969 的影響,對 jQuery 1.6、1.6.1、1.6.2 三個版本有影響。

另外也提到了 hosting 的部份,可以看到 Google Hosted Libraries 還是佔有最高的比率。

cURL 接下來的安全性更新...

cURL 的維護老大放話要大家注意接下來的安全性更新:「An alert on the upcoming 7.51.0 release」。

最少 11 個安全性更新:

This release will bundle no less than _eleven_ security advisories and their associated fixes (unless we get more reported in the time we have left).

由於這些 security issue 的特性,會採取不公開的 branch 修正再 merge 回來,再加上這麼大的數量,對於穩定性的衝擊是未知的:

Merging eleven previously non-disclosed branches into master just before a release is not ideal but done so to minimize the security impact on existing users when the problems get known.

所以目前的規劃是會在 release 的 48 個小時前公開 (希望藉由這封信讓有能力的人一起集中來看),藉此來降低衝擊:

My plan is to merge them all into master and push around 48 hours before release, watch the autobuilds closesly, have a few extra coverity scans done and then fix up what's found before the release.

這安全更新的數量好像有點多 orz

Cisco 與 Fortinet 防火牆的 RCE 漏洞

NSA 使用這些漏洞來大量監聽企業的流量:「Leaked Exploits are Legit and Belong to NSA: Cisco, Fortinet and Snowden Docs Confirm」。

Cisco 已經確認這個安全性漏洞了,全系列包括已經停產的 Cisco PIX、上個世代的 Cisco ASA 5500 (但還有些型號還在賣),以及目前主力的 Cisco ASA 5500-X,另外還包括了安全模組系列也中獎:「Cisco Adaptive Security Appliance SNMP Remote Code Execution Vulnerability」。

  • Cisco ASA 5500 Series Adaptive Security Appliances
  • Cisco ASA 5500-X Series Next-Generation Firewalls
  • Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
  • Cisco ASA 1000V Cloud Firewall
  • Cisco Adaptive Security Virtual Appliance (ASAv)
  • Cisco Firepower 4100 Series
  • Cisco Firepower 9300 ASA Security Module
  • Cisco Firepower Threat Defense Software
  • Cisco Firewall Services Module (FWSM)*
  • Cisco Industrial Security Appliance 3000
  • Cisco PIX Firewalls*

標星號的是目前已經沒有在維護的產品,這次只確認受到影響,但不會更新:

Cisco Firewall Service Modules and Cisco PIX Firewalls have passed the last day of software support milestone as stated in the published End of Life (EoL) documents. Further investigations into these devices will not be performed, and fixed software will not be made available.

這次 Cisco 的安全性問題是 SNMP 的洞造成的:

Administrators are advised to allow only trusted users to have SNMP access and to monitor affected systems using the snmp-server host command.

這個洞被 NSA 用來寫 exploit 植入系統:

This flaw was included inside two NSA exploits, dubbed EPICBANANA as well as JETPLOW, which is an enhanced version of EPICBANANA, but with better persistence capabilities, Cisco's Omar Santos said in a blog post.

在 NSA 洩漏出來的文件裡可以看到 ace02468bdf13579 這個特殊辨識字串,而在受感染的樣本上也找到了這個痕跡:

而且不只是 Cisco,其他幾家也中獎了,可以參考「The NSA Leak Is Real, Snowden Documents Confirm」這邊更多的資訊 @_@