Security researcher William J. Tolley reported a vulnerability that exists on most Linux distros, and other *nix operating systems which allows a network adjacent attacker to determine if another user is connected to a VPN, the virtual IP address they have been assigned by the VPN server, and whether or not there is an active connection to a given website. Additionally, we are able to determine the exact seq and ack numbers by counting encrypted packets and/or examining their size. This allows us to inject data into the TCP stream and hijack connections.
Most of the Linux distributions we tested were vulnerable, especially Linux distributions that use a version of systemd pulled after November 28th of last year which turned reverse path filtering off. However, we recently discovered that the attack also works against IPv6, so turning reverse path filtering on isn’t a reasonable solution, but this was how we discovered that the attack worked on Linux.
Adding a prerouting rule to drop packets destined for the client’s virtual IP address is effective on some systems, but I have only tested this on my machines (Manjaro 5.3.12-1, Ubuntu 19.10 5.3.0-23). This rule was proposed by Jason Donenfeld, and an analagous rule on the output chain was proposed by Ruoyu “Fish” Wang of ASU. We have some concerns that inferences can still be made using slightly different methods, but this suggestion does prevent this particular attack.
There are other potential solutions being considered by the kernel maintainers, but I can’t speak to their current status. I will provide updates as I receive them.
We have attached his original disclosure He provided to distros () vs openwall org and security () kernel org below, with at least one critical correction: I orignally listed CentOS as being vulnerable to the attack, but this was incorrect, at least regarding IPv4. We didn’t know the attack worked against IPv6 at the time we tested CentOS, and I haven’t been able to test it yet.
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OpenBSD, an open-source operating system built with security in mind, has been found vulnerable to four new high-severity security vulnerabilities, one of which is an old-school type authentication bypass vulnerability in BSD Auth framework.
The other three vulnerabilities are privilege escalation issues that could allow local users or malicious software to gain privileges of an auth group, root, as well as of other users, respectively.
The vulnerabilities were discovered and reported by Qualys Research Labs earlier this week, in response to which OpenBSD developers released security patches for OpenBSD 6.5 and OpenBSD 6.6 just yesterday—that’s in less than 40 hours.
Here’s a brief explanation of all four security vulnerabilities in OpenBSD—a free and open-source BSD-based Unix-like operating system—along with their assigned CVE identifiers
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Cybersecurity researchers have uncovered a new, previously undiscovered destructive data-wiping malware that is being used by state-sponsored hackers in the wild to target energy and industrial organizations in the Middle East.
Dubbed ZeroCleare, the data wiper malware has been linked to not one but two Iranian state-sponsored hacking groups—APT34, also known as ITG13 and Oilrig, and Hive0081, also known as xHunt.
A team of researchers at IBM who discovered the ZeroCleare malware says that the new wiper malware shares some high-level similarities with the infamous Shamoon, one of the most destructive malware families known for damaging 30,000 computers at Saudi Arabia’s largest oil producer in 2012.
Just like the Shamoon wiper malware, ZeroCleare also uses a legitimate hard disk driver called ‘RawDisk by ElDos’ to overwrite the master boot record (MBR) and disk partitions of targeted computers running the Windows operating system.
Though EldoS driver is not signed, the malware still manages to run it by loading a vulnerable but signed Oracle’s VirtualBox driver, exploiting it to bypass the signature checking mechanism and load the unsigned EldoS driver.
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Cybersecurity researchers today uncovered details of two new vulnerabilities in the GoAhead web server software, a tiny application widely embedded in hundreds of millions of Internet-connected smart devices.
One of the two vulnerabilities, assigned as CVE-2019-5096, is a critical code execution flaw that can be exploited by attackers to execute malicious code on vulnerable devices and take control over them.
The first vulnerability resides in the way multi-part/form-data requests are processed within the base GoAhead web server application, affecting GoAhead Web Server versions v5.0.1, v.4.1.1, and v3.6.5.
According to the researchers at Cisco Talos, while processing a specially crafted HTTP request, an attacker exploiting the vulnerability can cause use-after-free condition on the server and corrupt heap structures, leading to code execution attacks.
The second vulnerability, assigned as CVE-2019-5097, also resides in the same component of the GoAhead Web Server and can be exploited in the same way, but this one leads to denial-of-service attacks.
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A newly discovered Android vulnerability is actively exploited by malware such as the BankBot banking Trojan and it impacts all versions of the operating system up to and including Android 10.
The new vulnerability discovered by Promon security researchers was named StrandHogg and it can be exploited without the need of rooting the device.
Once exploited, it allows malicious apps to camouflage as almost any legitimate app, with Promon finding that “all of the 500 most popular apps (as ranked by app intelligence company 42 Matters) are vulnerable to StrandHogg.”
Unique Android Vulnerability
StrandHogg is “unique because it enables sophisticated attacks without the need for a device to be rooted, uses a weakness in the multitasking system of Android to enact powerful attacks that allows malicious apps to masquerade as any other app on the device,” says Promon.
“This exploit is based on an Android control setting called ‘taskAffinity’ which allows any app – including malicious ones – to freely assume any identity in the multitasking system they desire.”
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