Re-Sharing allows increase of privileges (NC-SA-2020-029)

A logic error in Nextcloud Server 19.0.0 caused a privilege escalation allowing malicious users to reshare with higher permissions than they got assigned themselves...

Medium: openssl11

Issue Overview: In situations where an attacker receives automated notification of the success or failure of a decryption attempt an attacker, after sending a very large number of messages to be decrypted, can recover a CMS/PKCS7 transported encryption key or decrypt any RSA encrypted message tha...

CISO Stressbusters Post #3: 3 ways to share accountability for security risk management

Jim Eckart, former Chief Information Security Officer CISO of The Coca-Cola Company and current Chief Security Advisor at Microsoft shares his advice for relieving stress in today’s CISO Stressbuster post. If you are a CISO, it can feel like the responsibility for keeping the company secure rests...

Google Chrome CORS Policy Bypass Vulnerability

Chrome is a simple and efficiently designed web browsing tool developed by Google that is characterized by its simplicity and speed. A CORS policy bypass vulnerability exists in versions of Google Chrome prior to 84.0.4147.89, which can be exploited by an attacker to bypass the policy...

GDI+ Remote Code Execution Vulnerability

A remote code execution vulnerability exists in the way that the Windows Graphics Device Interface GDI handles objects in the memory. An attacker who successfully exploited this vulnerability could take control of the affected system. An attacker could then install programs; view, change, or dele...

Windows Imaging Component Information Disclosure Vulnerability

An information disclosure vulnerability exists in Windows when the Windows Imaging Component fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user's system. There are multiple ways an attacker...

Windows Font Library Remote Code Execution Vulnerability

A remote code execution vulnerability exists when the Windows font library improperly handles specially crafted fonts. For all systems except Windows 10, an attacker who successfully exploited the vulnerability could execute code remotely. For systems running Windows 10, an attacker who...

Microsoft Graphics Remote Code Execution Vulnerability

A remote code execution vulnerability exists when the Windows font library improperly handles specially crafted embedded fonts. An attacker who successfully exploited the vulnerability could take control of the affected system. An attacker could then install programs; view, change, or delete data...

Ask Me Anything – Celebrating The Fifth Anniversary Of My Monthly Threat Webinar

In July 2015, I did my first threat webinar. I had planned to do it on a monthly basis, and never imagined I would still be doing it five years later, but here I am, still creating monthly webinars. I still do. I started the webinar series to help people understand the different threats targeting...

Automattic: Denial-of- service By Cache Poisoning The Cross-Origin Resource Sharing Misconfiguration Allow Origin Header

Summery: The wp-json implementation on some WordPress websites I've tested is vulnerable to Denial-of-service where by an attacker can provide an arbitrary origin header in the request, which is then echoed back in the response via the Access-Control-Allow-Origin header, which is cached and serve...

Hong Kong's Security Law Puts Big Tech at a Crossroads

As China exerts more power over the city, companies like Facebook and Google have stopped handing over data—for now...

CVE-2020-15565

A flaw was found in Xen, in the page table sharing between the IOMMU and CPU. This flaw allows a malicious guest user to access sensitive information pertaining to other guests to crash the host, resulting in a denial of service and privilege escalation. The highest threat from this vulnerability...

DEBIAN-CVE-2020-15565

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both...

CVE-2020-15565

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both...

CVE-2020-15565

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both...

Design/Logic Flaw

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both...

CVE-2020-15565

Root cause: CVE-2020-15565 arises from insufficient cache write-back under VT-d when page tables are shared between IOMMU and CPU, requiring flushing of both CPU and IOMMU TLBs. A backport/backing fixes missed a necessary cache flush, leaving IOMMU updates potentially non-coherent. Affected produ...

insufficient cache write-back under VT-d

ISSUE DESCRIPTION When page tables are shared between IOMMU and CPU, changes to them require flushing of both TLBs. Furthermore, IOMMUs may be non-coherent, and hence prior to flushing IOMMU TLBs CPU cached also needs writing back to memory after changes were made. Such writing back of cached dat...

July 7, 2020, update for Excel 2016 (KB4484437)

None None...

Automattic: Users can bypass page restrictions via Export feature at "Share" feature in CrowdSignal

Summary: Hi team, If you upgraded your account, you can share your survey results via "Share" button. F893428 As you can see, I selected Results page on Allow access to the following. So user will access only Results page. But if user has the Export feature. User can export the restricted pages...