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The two Teams vulnerabilities are rated Critical, because the side-effects could lead directly to remote code execution (RCE). In addition to installing the updates a script must be run.Īlternatively you can accomplish the same by running commands from the command line in a PowerShell window or some other terminal.

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Importantly, patching against this hole isn’t just a matter of downloading and installing the Patch Tuesday updates, because Microsoft warns sysadmins as follows: Obviously, the ability to access an existing user account would almost certainly give attackers code execution powers, albeit only as unprivileged users, as well as to snoop around your network, even if not enough access to make off with your trophy data.

The Exchange bug is only rated Important by Microsoft, perhaps because the vulnerability doesn’t directly give attackers a way to run untrusted code, but does give them a way to attack and recover passwords for other users, after which the attackers could login illegally as a legitimate user. Microsoft Exchange Server: CVE-2023-21709.

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Other notable but non-zero-day updates this month include three with high cybersecurity danger scores on the CVSS scale, where 10/10 means the greatest risk if someone does figure out how to abuse the bug: Unsurprisingly, therefore, we are sticking to our usual recommendation, namely: Do not delay Patch it today.

Why the missing resource section made the file vulnerable, and what sort of exploits were made possible by this manufacturing flaw.Ĭonfusingly, Microsoft’s main Patch Tuesday bug-listing page says Exploitation Detected against this item, without saying what sort of attacks were carried out.īut the Advisory page says merely Exploitation More Likely, as though it isn’t currently, and never has been, a zero-day hole for which working attack methods are already known.

How it got digitally signed in an obviously incomplete state.

How it passed its quality assurance tests with a key component of the executable file itself missing.

Resources typically specify must-have run-time program data such as messages in multiple languages, icons, menus and other user interface components.

How the original version was able to run at all without its RSRC section.

The original version was published without a RSRC section, which contains resource information for a module. The Memory Integrity System Readiness Scan Tool (hvciscan_amd64.exe and hvciscan_arm64.exe) is used to check for compatibility issues with memory integrity, also known as hypervisor-protected code integrity (HVCI). The second advisory, ADV230004, doesn’t mention any CVE numbers at all, so we can’t tell you what it’s supposed to fix, or why the original problem was an exploitable bug in the first place. We’re therefore assuming that explicitly listing the new security features added to Office this month (and you would usally expect an “advisory” to give you actionable advice along those lines) would give away new tips and tricks for cybercriminals to abuse, over and above the already-known bypass techniques that were fixed last month.

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The special Advisory page doesn’t shed much more light on the issue, saying simply, “Microsoft has released an update for Microsoft Office that provides enhanced security as a defense in depth measure.”

Technically, then, this doesn’t seem to be a zero-day this month, given that there was a patch for it in July 2023, even though it counts as an Exploitation Detected bug because crooks were historically known to be abusing the vulnerability before any patch was available.

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The idea is that even if you don’t open them immediately, but only look at them days or weeks later, Windows will nevertheless warn you that they came from an untrusted source and thereby help to protect you from yourself.Īs a result, crooks love to find ways to sidestep the MotW labelling system, because it lets them deliver untrusted content in such a way that you might not remember where it came from later on. That bug related to Microsoft’s so-called Mark of the Web (MotW), also known as the Internet Zone system, whereby files that arrive via the internet, for example as saved email attachments or downloaded files, are tagged by the operating system for later. Apparently, the above Office advisory relates to follow-up security improvements in Office to deal with CVE-2023-36884, which was a zero-day until last month, when it was patched in the July 2023 security updates.

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