Jul 22 2022

Candiru surveillance spyware DevilsTongue exploited Chrome Zero-Day to target journalists

Category: Web Security,Zero dayDISC @ 9:13 am

The spyware developed by Israeli surveillance firm Candiru exploited recently fixed CVE-2022-2294 Chrome zero-day in attacks on journalists.

Researchers from the antivirus firm Avast reported that the DevilsTongue spyware, developed, by Israeli surveillance firm Candiru, was used in attacks against journalists in the Middle East and exploited recently fixed CVE-2022-2294 Chrome zero-day.

The flaw, which was fixed by Google on July 4, 2022, is a heap buffer overflow that resides in the Web Real-Time Communications (WebRTC) component, it is the fourth zero-day patched by Google in 2022.

Most of the attacks uncovered by Avast researchers took place in Lebanon and threat actors used multiple attack chains to target the journalists. Other infections were observed in Turkey, Yemen, and Palestine since March 2022.

In one case the threat actors conducted a watering hole attack by compromising a website used by employees of a news agency.

The researchers noticed that the website contained artifacts associated with the attempts of exploitation for an XSS flaw. The pages contained calls to the Javascript function “alert” along with keywords like “test”, a circumstance that suggests the attackers were testing the XSS vulnerability, before ultimately exploiting it to inject the loader for a malicious Javascript from an attacker-controlled domain (i.e. stylishblock[.]com).

Candiru spyware

This injected code was used to route the victims to the exploit server, through a chain of domains under the control of the attacker.

Once the victim lands on the exploit server, the code developed by Candiru gathers more information the target system, and only if the collected data satisfies the exploit server the exploit is used to deliver the spyware.

“While the exploit was specifically designed for Chrome on Windows, the vulnerability’s potential was much wider. Since the root cause was located in WebRTC, the vulnerability affected not only other Chromium-based browsers (like Microsoft Edge) but also different browsers like Apple’s Safari.” reads the analysis published by Avast. “We do not know if Candiru developed exploits other than the one targeting Chrome on Windows, but it’s possible that they did.”

The zero-day was chained with a sandbox escape exploit, but experts were not able to recover it due to the protection implemented by the malware.

After getting a foothold on the victim’s machine, the DevilsTongue spyware attempts to elevate its privileges by exploiting another zero-day exploit. The malicious software targets a legitimate signed kernel driver in a BYOVD (Bring Your Own Vulnerable Driver) fashion. In order to exploit the the driver, it has to be first dropped to the filesystem (Candiru used the path C:\Windows\System32\drivers\HW.sys), experts pointed out that this could be used as an indicator of compromise. 

“While there is no way for us to know for certain whether or not the WebRTC vulnerability was exploited by other groups as well, it is a possibility. Sometimes zero-days get independently discovered by multiple groups, sometimes someone sells the same vulnerability/exploit to multiple groups, etc. But we have no indication that there is another group exploiting this same zero-day.” concludes the report.

Tags: Candiru surveillance spyware, Chrome zero-day

Feb 15 2022

Google fixes a Chrome zero-day flaw actively exploited in attacks

Category: Zero dayDISC @ 10:10 am

Google fixed a high-severity zero-day flaw, tracked as CVE-2022-0609, actively exploited with the release of Chrome emergency update for Windows, Mac, and Linux. This is the first Chome zero-day fixed this year by Google.

The zero-day is a use after free issue that resides in Animation, the bug was reported by Adam Weidemann and Clément Lecigne of Google’s Threat Analysis Group.

“Use after free in Animation. Reported by Adam Weidemann and Clément Lecigne of Google’s Threat Analysis Group on 2022-02-10 [$TBD][1285449]” reads the security advisory published by Google. “Google is aware of reports that an exploit for 

 exists in the wild.”

The emergency patches will be rolled out in the next weeks. Users could update their browser manually by visiting the entry Chrome menu > Help > About Google Chrome.

Google did not disclose technical details for the CVE-2022-0609 to avoid massive exploitation of the bug. The IT giant also avoided disclosing info regarding the attack in the wild exploiting the flaw.

“Access to bug details and links may be kept restricted until a majority of users are updated with a fix,” Google added.

Countdown to Zero Day: Stuxnet and the Launch of the World’s First Digital Weapon

Tags: Chrome zero-day, Countdown to Zero Day

Mar 04 2021

Another Chrome zero-day exploit – so get that update done!

Category: Web SecurityDISC @ 12:32 am

Almost exactly a month ago, or a couple of days under an average month given that February was the short one, we warned of a zero-day bug in Google’s Chromium browser code.

Patch now, we said.

And we’re saying it again, following Google’s otherwise cheery release of version 89.0.4389.72:

The Chrome team is delighted to announce the promotion of Chrome 89 to the stable channel for Windows, Mac and Linux. This will roll out over the coming days/weeks.

We’ve never quite understood Google’s mention of rolling out updates over “days/weeks” in an update bulletin that includes 47 security fixes, of which eight have a severity level of High.

In fact, we suggest going out manually and making sure you’ve got your Chrome update already, without waiting for those day/weeks to elapse until the update finds you.

If you’re using a Chromium-based product from another browser maker, check with that vendor for information about whether their build is affected by this bug, and if so whether the patch is downloadable yet.

Tags: Chrome zero-day

Feb 05 2021

Chrome zero-day browser bug found

Category: Web Security,Zero dayDISC @ 10:20 am

Tags: Chrome zero-day