Microsoft patches actively exploited Windows Kernel flaw
The patch is one of 112 issued in November's Patch Tuesday
Microsoft has released fixes for 112 vulnerabilities, including an actively-exploited zero-day flaw, as part of its November 2020 Patch Tuesday,
Of the 112 vulnerabilities fixed, 17 were classified as 'critical', 93 as 'important', and two as 'moderate'.
According to Tenable staff research engineer Satnam Narang, CVE-2020-17087 was “exploited in the wild as part of a vulnerability chain with CVE-2020-15999, a buffer overflow vulnerability in the FreeType 2 library used by Google Chrome”.
“The elevation of privilege vulnerability was used to escape Google Chrome’s sandbox in order to elevate privileges on the exploited system. This is the second vulnerability chain involving a Google Chrome vulnerability and a Windows vulnerability that was exploited in the last year,” he said.
Narang added that “chaining vulnerabilities is an important tactic for threat actors”.
“The Cybersecurity and Infrastructure Security Agency (CISA) published a joint advisory with the FBI last month that highlighted threat actors chaining unpatched vulnerabilities to gain initial access into a target environment and elevate privileges.
"Even though Google and Microsoft have now patched these flaws, it is imperative for organizations to ensure they’ve applied these patches before threat actors begin to leverage them more broadly."
Microsoft was also criticised for removing CVE description information from its Patch Tuesday release. Tenable CSO Bob Huber described the decision as a “bad move, plain and simple”, adding that “by relying on CVSSv3 ratings alone, Microsoft is eliminating a ton of valuable vulnerability data that can help inform organizations of the business risk a particular flaw poses to them”.
"While I appreciate that they are adopting the industry-standard format in CVSSv3, Microsoft also must consider that many folks who review Patch Tuesday releases aren’t security practitioners. They are the IT counterparts responsible for actually applying the updates who often aren’t able (and shouldn’t have to) decipher raw CVSS data,” said Huber.
Adobe has also released a small security update to resolve vulnerabilities in Connect and Reader Mobile. This comes just days after the software provider urged Windows and macOS users to update their Acrobat and Reader applications after discovering that they contained flaws that could be exploited to execute arbitrary code.
How to be an MSP: Seven steps to success
Building your business from the ground upDownload now
The smart buyer’s guide to flash
Find out whether flash storage is right for your businessDownload now
How MSPs build outperforming sales teams
The definitive guide to salesDownload now
The business guide to ransomware
Everything you need to know to keep your company afloatDownload now