cbcvebase.
CVE-2017-0089
published 2017-03-17

CVE-2017-0089: Uniscribe in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to execute arbitrary code via a crafted…

PriorityP275high8.8CVSS 3.0
AVNACLPRNUIRSUCHIHAH
EXPLOIT
EPSS
57.34%
99.0th percentile
Uniscribe in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to execute arbitrary code via a crafted web site, aka "Uniscribe Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0072, CVE-2017-0083, CVE-2017-0084, CVE-2017-0086, CVE-2017-0087, CVE-2017-0088, and CVE-2017-0090.

Affected

14 ranges
VendorProductVersion rangeFixed in
microsoftwindows_10
microsoftwindows_10
microsoftwindows_server_2008
microsoftwindows_server_2012
microsoft_corporationwindows_uniscribe
msrcwindows_7_for_32-bit_systems_service_pack_1
msrcwindows_7_for_x64-based_systems_service_pack_1
msrcwindows_server_2008_for_32-bit_systems_service_pack_2
msrcwindows_server_2008_for_itanium-based_systems_service_pack_2
msrcwindows_server_2008_for_x64-based_systems_service_pack_2
msrcwindows_server_2008_r2_for_itanium-based_systems_service_pack_1
msrcwindows_server_2008_r2_for_x64-based_systems_service_pack_1
msrcwindows_vista_service_pack_2
msrcwindows_vista_x64_edition_service_pack_2

Detection & IOCsextracted from sources · hover to see the quote

urlhttps://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41652.zip
  • Crash occurs in USP10!UpdateGlyphFlags+0x30 — monitor for access violations (code c0000005) originating from USP10.dll at this function offset during font/text rendering
  • Heap out-of-bounds write triggered via crafted font file processed by Uniscribe; call chain passes through ScriptStringAnalyse -> ScriptShape -> GenericEngineGetGlyphs -> SubstituteOtlGlyphs -> ApplyFeatures -> UpdateGlyphFlags — look for anomalous font file rendering triggering this call stack
  • Exploitation vector includes a specially crafted website or document file; monitor for users navigating to attacker-controlled sites or opening suspicious document attachments that trigger Uniscribe font processing
  • Enable PageHeap on test systems to reliably reproduce the crash; in production, watch for USP10.dll access violations even without PageHeap as crash can occur in default configuration
  • ·The PoC requires a custom program that displays all of the font's glyphs at various point sizes to reliably trigger the vulnerability; standard font preview may not be sufficient
  • ·CVE-2017-0089 is one of several distinct Uniscribe RCE vulnerabilities patched in MS17-011; do not conflate IOCs or detections with CVE-2017-0072, CVE-2017-0083, CVE-2017-0084, CVE-2017-0086, CVE-2017-0087, CVE-2017-0088, or CVE-2017-0090

CVSS provenance

nvdv3.08.8HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv2.09.3CRITICALAV:N/AC:M/Au:N/C:C/I:C/A:C
vendor_msrc8.8HIGH
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