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Exodus Intelligence

Microsoft Windows Cloud Files Minifilter TOCTOU Privilege Escalation

Exodus Intel VRT · 2025-10-20 · Read original ↗

ATT&CK techniques detected

11 predictions
T1068Exploitation for Privilege Escalation
93%
"vulnerability efforts, visit www. exodusintel. com or contact info @ exodusintel. com for further discussion. the post microsoft windows cloud files minifilter toctou privilege escalation appeared first on exodus intelligence."
T1055.001Dynamic-link Library Injection
92%
") are copied into the placeholderpayload _ stack variable. at [ 8 ], it validates the filename contained in the relname field of the placeholderpayload, it checks all the wide characters. if any of the characters is equal to the \ or the : character, it stops the current relnamep…"
T1068Exploitation for Privilege Escalation
70%
". dll. if the relname change happens just after the relname validation then the fltcreatefileex2 ( ) function will follow the junction created on the justastring directory and create the newfile. dll in c : \ windows \ system32. once the monitor thread detects the c : \ windows \…"
T1055.001Dynamic-link Library Injection
68%
". placeholderpayload ) and at [ 5 ] it validates that the buffer is a userspace buffer. since the address does not belong to a non - paged pool and it is not already mapped into the kernel virtual address space then it is mapped by invoking the mmmaplockedpagesspecifycache ( ) fu…"
T1055.001Dynamic-link Library Injection
65%
"fileobject, 0x100180u, objectattributes, iostatusblock, allocationsize, fileattributes, 0, 2u, createoptions, 0i64, 0, 0x800u, drivercontext ) ; [ truncated ] continue : v29 = ( pfile _ object ) dirhandle _ cp ; [ truncated ] if ( ( int ) v24 = 0 | | ( syncpolicy _ cp 1 ) = = 0 )…"
T1068Exploitation for Privilege Escalation
55%
"var fileid the file identity content. when placeholdercount is greater than one then the placeholder _ payload is an array of create _ placeholder _ t structures, the placeholdercount information is not contained in the ioctl _ 0x903bc data structure since the processing in kerne…"
T1055.001Dynamic-link Library Injection
44%
"system32. step 2 – trigger the vulnerability the vulnerability can be exploited by running multiple threads in parallel where one of them is responsible for monitoring if the file is created, while some others are running in an endless loop to create a placeholder operation and t…"
T1055.001Dynamic-link Library Injection
41%
"before the fltcreatefileex2 ( ) execution [ 15 ]. the fltcreatefileex2 ( ) is invoked by passing the io _ ignore _ share _ access _ check value as the flags argument and the object _ attributes. attributes is set to the obj _ kernel _ handle | obj _ inherit mask. between [ 8 ] an…"
T1055.001Dynamic-link Library Injection
39%
". dll. if the relname change happens just after the relname validation then the fltcreatefileex2 ( ) function will follow the junction created on the justastring directory and create the newfile. dll in c : \ windows \ system32. once the monitor thread detects the c : \ windows \…"
T1055.001Dynamic-link Library Injection
39%
"5 )! = 0 ) / / non paged pool | system _ va _ mapped mappedsystemva = ( create _ placeholder _ t * ) memorydescriptorlist - ; else mappedsystemva = ( create _ placeholder _ t * ) mmmaplockedpagesspecifycache ( memorydescriptorlist, 0, mmcached, 0i64, 0, 0x40000010u ) ; mmapped _ …"
T1574.001DLL
38%
"justastring directory exists and it is a junction to a directory not writable by the user then fltcreatefileex2 ( ) will follow the junction creating the newfile. dll in the non - writable directory. exploitationin order to exploit this vulnerability the following steps must be p…"

Summary

By Michele Campa Overview In this blog post we take a look at a race condition we found in Microsoft Windows Cloud Minifilter (i.e. cldflt.sys ) in March 2024. This vulnerability was patched in October 2025 and assigned CVE-2025-55680 . The vulnerability occurs within the HsmpOpCreatePlaceholders() function, which is invoked when the CfCreatePlaceholders() function is ... Read more Microsoft Windows Cloud Files Minifilter TOCTOU Privilege Escalation

The post Microsoft Windows Cloud Files Minifilter TOCTOU Privilege Escalation appeared first on Exodus Intelligence.