Monthly Archives: April 2020

Potential Risk of CVE

Security Focus – Juniper Networks (9th April 2020)

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Preface: Technology cannot fight against coronavirus in the moment.
Easter, commemorating the resurrection of Jesus from the dead.
Wish that human can managed to fight it all. Comparing with coronavirus. The vulnerability in computer system looks easy resolve.

Security focus – Juniper Network product:

A privilege escalation vulnerability in Juniper Networks Junos OS devices configured with dual Routing Engines (RE), Virtual Chassis (VC) or high-availability cluster may allow a local authenticated low-privileged user with access to the shell to perform unauthorized configuration modification. This issue does not affect Junos OS device with single RE or stand-alone configuration.

My observation: Refer to attach diagram, below is the information for supplement.

Fundamental
/bin/sh is an executable representing the system shell. Actually, it is usually implemented as a symbolic link pointing to the executable for whichever shell is the system shell.
Since it is a bash file so commands inside it will get executed, and if we execute the file as root, then all the commands inside it will also get executed as root. So, let’s take advantage of that and append /bin/bash -i to the file. This will execute bash as root, which in turn will open the root shell.

Official announcement of this matter (JunOS vulnerability) – https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11010&cat=SIRT_1&actp=LIST

Potential Risk of CVE

CVE-2020-10808 Vesta Control Panel Authenticated Remote Code Execution 6th April 2020

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Preface: Dockerized Vesta Control Panel aka vestacp. You can download vesta source code and modify it the way you want. You are totally free to do it so to Vesta is licensed under GPL

Background: You are able to install and configure VestaCP on an Alibaba Cloud Elastic Compute Service (ECS) instance with CentOS 7

Vulnerability details: The proof of concept by Metasploit that a Low privileged authenticated users can execute arbitrary commands under the context of the root user. An authenticated attacker with a low privileges can inject a payload in the file name starts with dot. During the user backup process, this file name will be evaluated by the v-user-backup bash scripts. As result of that backup process, when an attacker try to list existing backups injected payload will be executed.

Remedy – Remedy looks not release yet, it is suggested to focus in official announcement. https://forum.vestacp.com/viewforum.php?f=25

Application Development, Data privacy

Do you worry your camera on your iphone manipulate by hacker. 6th Apr 2020

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Preface: Apple paid $75,000 to the hacker for reporting the camera hijacking bugs. As said, bug is never ending. Perhaps next round will be yours.

Background: If you let your friend access your phone for 5–7 minutes, they could have downloaded spyware. Perhaps this action only for joking. As a matter of fact, hacker can implant malicious code into a web page to conduct the similar function. Most recently, Apple paid $75,000 to the hacker for reporting the camera hijacking bugs.

Observation: Referring to the attached picture, a simple html file can easily trigger the iphone camera function. Because the control effect of apple is very good. Therefore, it will trigger the control and then let you know. In fact, a hacker hijacked your iPhone camera through a software application or website. However, the iPhone owner can know which application can access your camera. Therefore, it is recommended to check the phone settings in a timely manner. Apple paid $75,000 to the hacker for reporting the camera hijacking bugs. As said, bug is never ending. Perhaps next round will be yours.

Chrome and Safari on iOS can access your lens without special markup and can perform both AJAX POST and synchronous form POST operations just like a desktop browser. So, please be careful to use your phone doing web browsing.

Potential Risk of CVE

Staying alert! – Mozilla Patches Critical Vulnerabilities in Firefox, Firefox ESR (3rd Apr 2020)

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Preface: According on 2020 market statistic, FireFox market share only 9.25%. But Chrome has 68.11% coverage. However I like FireFox.

How Firefox’s memory allocator works?

Firefox uses a memory allocator called moz jemalloc. There are two properties which focus by cyber security expert so far!

[PSJ] – In essence, a chunk is broken into several runs.

– Each run holds regions of a specific size. [TSOF]

– The feature of jemalloc is that it operates in a last-in-first-out (LIFO) manner, a free followed by a garbage collection and a subsequent allocation request for the same size, most likely ends up in the freed region.

Vulnerability details: CVE-2020-6819 is a use-after-free vulnerability due to a race condition when the nsDocShell destructor is running. CVE-2020-6820 is a use-after-free vulnerability due to a race condition in the ReadableStream class, which is used to read a stream of data.

Official announcement – https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/

Potential Risk of CVE, Public safety

Why US Homeland security urge to public stay alert of the vulnerability on DrayTek Devices? 3rd April 2020

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Preface: A conspiracy was leaked this week, someone ambitious to spying the world.

Details: The espionage activities will be exploit computer technology as 1st approach in today. It is merely relies on design weakness. Yes, it is the vulnerability. When I read the conspiracy details, I was wonder that if the formulation of this design (see attached diagram) goals to do a DDoS. Perhaps this is no a perfect way. However when US Homeland security urge to US citizen staying alert of the vulnerability found in DrayTek Devices. As everyone knows, today’s Tor network cannot perfectly hide the whereabouts of hackers. Because law enforcement already shutdown the proxy servers on the network. Besides, attacker also worries that does the proxy server has monitoring function. From attacker view point, they should perfectly hide itself. Refer to attached diagram, the new formulation of botnet technique will be exploited the new vulnerability found on IoT as a component. It looks like a plug-in module.

There are two types of operating system that sit under the SDK. Low cost and lower specification routers will select the RTOS. Since low end router cannot fulfill their requirement. Perhaps the VPN Router is the correct target because when compromised VPN router form a bot net group can compensate the current resources outage in Tor network.

Immediate action: Multiple vulnerabilities have been discovered in DrayTek devices which could allow for arbitrary code execution. If you are customer of DrayTek. Please do the upgrade immediately. https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-(cve-2020-8515)

Data privacy

Marriott says 5.2 million guest records were stolen in another data breach, said Marriott. 31st Mar 2020

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Preface: Perhaps this is not the key factor causes data breach on Jan 2020. But the sound can tell.

Observation: It is believed that a new round of data breaches by Marriott this week has attracted attention. Maybe the hotel industry will run within 24 hours. Do maintenance or system upgrade is not easy. We only look at the homepage of Marriott’s “Member Credit Card Rewards”. Found a vulnerable “jquery” still in operation. From attacker point of view, such hints similar give him an indication that this web site may have more space for exploitation. As we know, jQuery(version 1.11.3) which has XSS vulnerability found on March, 2017. Why still valid in an enterprise web site. The root cause is hard to tell. May be it is a extend legacy web application. I think you will be concern the details of official announcement. See below url:

https://mysupport.marriott.com/