Apple, Microsoft, and Google Just Fixed Multiple Zero-Day Flaws


Earlier in the month, Google fixed another zero-day flaw, a heap buffer overflow issue initially tracked as CVE-2023-4863, which it thought impacted only the Chrome browser. But two weeks after fixing the issue, researchers discovered it was worse than they thought, affecting the widely-used libwebp image library for rendering images in the WebP format.

Now tracked as CVE-2023-5129, it is thought the bug impacts every application that uses the libwebp library to process WebP images. “The scope of this vulnerability is much wider than initially assumed, affecting millions of different applications worldwide,” security firm Rezilion wrote in a blog.

The security outfit also thinks it is “highly likely” that the underlying issue in the libwebp library is the same issue resulting in CVE-2023-41064—one of the Apple flaws used as part of the BLASTPASS exploit chain to deploy the NSO Group’s Pegasus spyware.


Microsoft’s September Patch Tuesday is one to remember, as it fixed around 65 flaws, two of which are already being exploited by attackers. Tracked as CVE-2023-36761, the first is a Microsoft Word information disclosure vulnerability that could allow NTLM hashes to be exposed.

The second and most severe flaw is a privilege-escalation vulnerability in Microsoft Streaming Service Proxy tracked as CVE-2023-36802. An attacker who successfully exploited this vulnerability could gain system privileges, Microsoft said, adding that exploitation of the flaw has been detected.

Both flaws are marked as important, so it’s a good idea to update your devices as soon as you can.

Mozilla Firefox

Firefox has had a hectic month after Mozilla fixed 10 flaws in its privacy-conscious browser. CVE-2023-5168 is an out-of-bounds write bug in FilterNodeD2D1 affecting Firefox on Windows, rated as having a high impact.

CVE-2023-5170 is a flaw that could result in memory leak from a privileged process. This could be used to effect a sandbox escape if the correct data was leaked, Firefox owner Mozilla said in an advisory.

Meanwhile, CVE-2023-5176 covers memory safety bugs fixed in Firefox 118, Firefox ESR 115.3, and Thunderbird 115.3. “Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code,” Mozilla said.


At the start of the month, Cisco issued a patch for a vulnerability in the single sign-on implementation of Cisco BroadWorks Application Delivery Platform and Cisco BroadWorks Xtended Services Platform that could allow an unauthenticated, remote attacker to forge credentials to access an affected system. Tracked as CVE-2023-20238, the flaw has been given a maximum CVSS score of 10.

Also this month, Cisco patched a zero-day in Adaptive Security Appliance and Firepower Threat Defense software already exploited in Akira ransomware attacks. Tracked as CVE-2023-20269 and with a medium severity CVSS score of 5, the vulnerability in the remote access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a brute-force attack to identify valid username and password combinations.


Enterprise software firm SAP has issued several important fixes as part of its September Security Patch Day. This includes a patch for CVE-2023-40622, an information disclosure vulnerability in SAP BusinessObjects Business Intelligence Platform with a CVSS score of 9.9. “A successful exploit provides information that can be used in subsequent attacks, leading to a complete compromise of the application,” security firm Onapsis said.

CVE-2023-40309 is a missing authorization check issue in SAP CommonCryptoLib with a CVSS score of 9.8. The flaw can result in an escalation of privileges and in the worst case, attackers can compromise the affected application completely, Onapsis said.

Meanwhile, CVE-2023-42472 is an insufficient file type validation flaw in SAP BusinessObjects Business Intelligence Platform with a CVSS score of 8.7.

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