Public exploits are available for critical ImageMagick vulnerabilities, increasing the risk to websites that use the open source image-processing software.
Tag Archives: remote code execution
Hacker Installed a Secret Backdoor On Facebook Server to Steal Passwords
How to Hack Facebook?
That’s the most commonly asked question during this decade.
It’s a hacker dream to hack Facebook website for earning bug bounty or for any malicious purpose.
Facebook security team recently found that someone, probably a blackhat hacker with malicious intent, has breached into its server and installed a backdoor that was configured to steal Facebook employees’ login
Core Windows Utility Can Be Used to Bypass AppLocker
A researcher has discovered that Windows’ Regsvr32 can be used to download and run JavaScript and VBScript remotely from the Internet, bypassing AppLocker’s whitelisting protections.
Moxa Won’t Patch Publicly Disclosed Flaws Until August
A number of publicly disclosed vulnerabilities in Moxa networking gear won’t be patched until August, if at all, according to ICS-CERT.
Remotely Exploitable Bug in Truecaller Puts Over 100 Million Users at Risk
Security researchers have discovered a remotely exploitable vulnerability in Called ID app “Truecaller” that could expose personal details of Millions of its users.
Truecaller is a popular service that claims to “search and identify any phone number,” as well as helps users block incoming calls or SMSes from phone numbers categorized as spammers and telemarketers.
The service has mobile
Flash Player Update Patches 18 Remote Code Execution Flaws
Adobe today released a new version of Flash Player that patches 18 vulnerabilities, all of which can result in remote code execution attacks.
Drupal Update Fixes 10 Vulnerabilities, One Critical
Drupal addressed 10 vulnerabilities in the CMS this week, including a critical access bypass issue and another issue that could lead to remote code execution.
Critical glibc Flaw Puts Linux Machines and Apps at Risk (Patch Immediately)
A highly critical vulnerability has been uncovered in the GNU C Library (glibc), a key component of most Linux distributions, that leaves nearly all Linux machines, thousands of apps and electronic devices vulnerable to hackers that can take full control over them.
Just clicking on a link or connecting to a server can result in remote code execution (RCE), allowing hackers to steal credentials, spy on users, seize control of computers, and many more.
The vulnerability is similar to the last year’s GHOST vulnerability (CVE-2015-0235) that left countless machines vulnerable to remote code execution (RCE) attacks, representing a major Internet threat.
GNU C Library (glibc) is a collection of open source code that powers thousands of standalone apps and most Linux distributions, including those distributed to routers and other types of hardware.
The recent flaw, which is indexed as CVE-2015-7547, is a stack-based buffer overflow vulnerability in glibc’s DNS client-side resolver that is used to translate human-readable domain names, like google.com, into a network IP address.
The buffer overflow flaw is triggered when the getaddrinfo() library function that performs domain-name lookups is in use, allowing hackers to remotely execute malicious code.
How Does the Flaw Work?
The flaw can be exploited when an affected device or app make queries to a malicious DNS server that returns too much information to a lookup request and floods the program’s memory with code.
This code then compromises the vulnerable application or device and tries to take over the control over the whole system.
It is possible to inject the domain name into server log files, which when resolved will trigger remote code execution. An SSH (Secure Shell) client connecting to a server could also be compromised.
However, an attacker need to bypass several operating system security mechanisms – like ASLR and non-executable stack protection – in order to achieve successful RCE attack.
Alternatively, an attacker on your network could perform man-in-the-middle (MitM) attacks and tamper with DNS replies in a view to monitoring and manipulating (injecting payloads of malicious code) data flowing between a vulnerable device and the Internet.
Affected Software and Devices
All versions of glibc after 2.9 are vulnerable. Therefore, any software or application that connects to things on a network or the Internet and uses glibc is at RISK.
The widely used SSH, sudo, and curl utilities are all known to be affected by the buffer overflow bug, and security researchers warn that the list of other affected applications or code is almost too diverse and numerous to enumerate completely.
The vulnerability could extend to a nearly all the major software, including:
- Virtually all distributions of Linux.
- Programming languages such as the Python, PHP, and Ruby on Rails.
- Many others that use Linux code to lookup the numerical IP address of an Internet domain.
- Most Bitcoin software is reportedly vulnerable, too.
Who are Not Affected
The good news is users of Google’s Android mobile operating system aren’t vulnerable to this flaw. As the company uses a glibc substitute known as Bionic that is not susceptible, according to a Google representative.
Additionally, a lot of embedded Linux devices, including home routers and various gadgets, are not affected by the bug because these devices use the uclibc library as it is more lightweight than hefty glibc.
The vulnerability was first introduced in May 2008 but was reported to the glibc maintainers July 2015.
The vulnerability was discovered independently by researchers at Google and Red Hat, who found that the vulnerability has likely not been publicly attacked.
The flaw was discovered when one of the Google’s SSH apps experienced a severe error called a segmentation fault each time it attempted to contact to a particular Internet address, Google’s security team reported in a blog post published Monday.
Where glibc went Wrong
Google researchers figured out that the error was due to a buffer overflow bug inside the glibc library that made malicious code execution attacks possible. The researchers then notified glibc maintainers.
Here’s what went wrong, according to the Google engineers:
“glibc reserves 2048 bytes in the stack through alloca() for the DNS answer at _nss_dns_gethostbyname4_r() for hosting responses to a DNS query. Later on, at send_dg() and send_vc(), if the response is larger than 2048 bytes, a new buffer is allocated from the heap and all the information (buffer pointer, new buffer size and response size) is updated.”
“Under certain conditions a mismatch between the stack buffer and the new heap allocation will happen. The final effect is that the stack buffer will be used to store the DNS response, even though the response is larger than the stack buffer and a heap buffer was allocated. This behavior leads to the stack buffer overflow.”
Proof-of-Concept Exploit Released
Google bod Fermin J. Serna released a Proof-of-Concept (POC) exploit code on Tuesday.
With this POC code, you can verify if you are affected by this critical issue, and verify any mitigations you may wish to enact.
Patch glibc Vulnerability
Google researchers, working with security researchers at Red Hat, have released a patch to fix the programming blunder.
However, it is now up to the community behind the Linux OS and manufacturers, to roll out the patch to their affected software and devices as soon as possible.
For people running servers, fixing the issue will be a simple process of downloading and installing the patch update.
But for other users, patching the problem may not be so easy. The apps compiled with a vulnerable glibc version should be recompiled with an updated version – a process that will take time as users of affected apps have to wait for updates to become available from developers.
Meanwhile, you can help prevent exploitation of the flaw, if you aren’t able to immediately patch your instance of glibc, by limiting all TCP DNS replies to 1024 bytes, and dropping UDP DNS packets larger than 512 bytes.
For more in-depth information on the glibc flaw, you can read Red Hat blog post.
All Versions of Windows affected by Critical Security Vulnerability
Microsoft has released 13 security bulletins, six of which are considered to be critical, resolving a total of 41 security vulnerabilities in its software this month.
Every Windows version Affected:
One of the critical vulnerabilities affects all supported version of Windows, including Microsoft’s newest Windows 10 operating system, as well as Windows Server 2016 Tech Preview 4.
The
Critical Flaws Found in NETGEAR Network Management System
Netgear, one of the most popular router manufacturers, has been vulnerable to two different flaws that could allow hackers to compromise your corporate network and connected devices.
Reported critical vulnerabilities reside in the Netgear’s ProSafe NMS300 Model (Network Management System) – a centralized and comprehensive management application for network administrators that enables them
