cbcvebase.
CVE-2015-0057
published 2015-02-11

CVE-2015-0057: win32k.sys in the kernel-mode drivers in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8…

PriorityP344high7.2CVSS 2.0
AVLACLAuNCCICAC
EXPLOIT
EPSS
12.75%
95.8th percentile
win32k.sys in the kernel-mode drivers in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability."

Affected

2 ranges
VendorProductVersion rangeFixed in
microsoftwindows_server_2008
microsoftwindows_server_2012

Detection & IOCsextracted from sources · hover to see the quote

hash455817A04F9D0A7094038D006518C85BE3892C99
hash7C36064F766BD13DB7EC2F444F4605566269F8E7
hashE608B456C816C07C60931FD6B20F74E46EBD7EF9
ip188.93.239.28:4843
ip38.64.199.33:4843
ip85.17.155.148:1234
urlhttps://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39035.zip
otherRC4 key: 4FzyDVuTsVGUstulVjI3xL7E9NM48ytG5GwtTHbLXzC4pihROe
commandwusa.exe /uninstall /kb:%d /quiet /%srestart
port4843
  • CVE-2015-0057 exploit uses InternalGetWindowText/NtUserInternalGetWindowText and NtUserDefSetText Windows GUI functions to perform arbitrary kernel read/write; monitor for unusual invocation of these NT user functions from low-privilege processes.
  • Sage 2.2 exploit targets the Local Descriptor Table (LDT) for ring-3 to ring-0 transition via a far call, rather than the traditional HalDispatchTable overwrite; detect unexpected LDT modifications in EPROCESS structures.
  • Exploit shellcode disables SMEP by modifying the CR4 register to allow kernel-mode execution of user-mode code; monitor for CR4 register modifications in kernel telemetry.
  • Exploit retrieves ntoskrnl.exe base address via IDT constant value 0x82888e00 (KIDTENTRY.Access + KIDTENTRY.ExtendedOffset) rather than traditional methods; this technique may evade behavioral detections watching for standard ntoskrnl base-address resolution.
  • Dridex checks for absence of patches KB3034344 and KB3013455 before deploying the CVE-2015-0057 EoP module (mod5); presence of these checks in network traffic or loader logic is a strong indicator of exploitation intent.
  • Dridex C2 communication for mod5 (CVE-2015-0057 EoP payload) uses HTTPS with RC4-encrypted XML containing a hard-coded key; network inspection for RC4-over-HTTPS to the listed C2 IPs on port 4843 is a detection opportunity.
  • Sage 2.2 uses UAC bypass via eventvwr.exe and registry hijacking to suppress UAC popup; monitor for eventvwr.exe spawning unexpected child processes or registry key modifications under HKCU\Software\Classes\mscfile.
  • Sage 2.2 download URLs use .info and .top TLDs with a numeric path; network detections should flag HTTP GET requests matching pattern: domain ending in .info or .top with a purely numeric URI path.
  • CVE-2015-0057 root cause is a Use-After-Free in xxxEnableWndSBArrows within win32k.sys triggered via ClientLoadLibrary user-mode callback; kernel crash dumps or ETW traces showing UAF in this function path indicate exploitation.
  • ·Sage 2.2 terminates itself if it detects sandbox/VM indicators (process names, file paths containing 'sample'/'malw'/'virus', computer name 'abc-win7', blacklisted CPUIDs such as KVM/QEMU/Xeon/'AMD Opteron 2386', or blacklisted MAC addresses); dynamic analysis environments must spoof these to obtain full execution.
  • ·Sage 2.2 strings are encrypted with ChaCha20, each with its own hard-coded decryption key; static string-based detection will not work without first decrypting the string table.
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