Notes on Windows Uniscribe Fuzzing

Posted by Mateusz Jurczyk of Google Project Zero Among the total of 119 vulnerabilities with CVEs fixed by Microsoft in the March Patch Tuesday a few weeks ago, there were 29 bugs reported by us in the font-handling code of the Uniscribe library. Admittedly the subject of font-related security ha...

Windows Uniscribe heap-based out-of-bounds read in USP10!ScriptApplyLogicalWidth（CVE-2017-0062）

We have encountered a crash in the Windows Uniscribe user-mode library, in the USP10!ScriptApplyLogicalWidth function, while trying to display a malformed EMF file: 920c.9190: Access violation - code c0000005 first chance First chance exceptions are reported before any exception handling. This...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, operating remotely, to obtain confidential information from the process’s memory through a specially crafted...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, operating remotely, to obtain confidential information from the process’s memory through a specially crafted...

The vulnerability of the Windows operating system allows a perpetrator to obtain confidential information from the process memory.

The vulnerability of the Uniscribe component of the Windows operating system is related to the lack of protection for service data. Exploiting this vulnerability allows a malicious actor, acting remotely, to obtain confidential information from the process’s memory through a specially crafted web...

Microsoft Windows - Uniscribe Heap-Based Out-of-Bounds Read in USP10!ScriptApplyLogicalWidth Trigger

Exploit for windows platform in category dos / poc Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1053 We have encountered a crash in the Windows Uniscribe user-mode library, in the USP10!ScriptApplyLogicalWidth function, while trying to display a malformed EMF file: ---...

Microsoft Windows - Uniscribe Font Processing Heap-Based Memory Corruption in USP10!MergeLigRecords

Exploit for windows platform in category dos / poc Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1026&desc=2 We have encountered a crash in the Windows Uniscribe user-mode library, in the memcpy function called by USP10!MergeLigRecords, while trying to display text using a...