CVE-2019-1127

published 2019-07-15

CVE-2019-1127: A remote code execution vulnerability exists in the way that DirectWrite handles objects in memory, aka 'DirectWrite Remote Code Execution Vulnerability'. This…

Priority P2 66 high 8.8 CVSS 3.0

AV N AC L PR N UI R S U C H I H A H

EXPLOIT

A remote code execution vulnerability exists in the way that DirectWrite handles objects in memory, aka 'DirectWrite Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-1117, CVE-2019-1118, CVE-2019-1119, CVE-2019-1120, CVE-2019-1121, CVE-2019-1122, CVE-2019-1123, CVE-2019-1124, CVE-2019-1128.

Affected

36 ranges · showing 25

Vendor	Product	Version range	Fixed in
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows	—	—
microsoft	windows_10	—	—
microsoft	windows_10	—	—
microsoft	windows_10	—	—
microsoft	windows_10	—	—
microsoft	windows_10_version_1903_for_32-bit_systems	—	—
microsoft	windows_10_version_1903_for_arm64-based_systems	—	—
microsoft	windows_10_version_1903_for_x64-based_systems	—	—
microsoft	windows_server	—	—
microsoft	windows_server	—	—
microsoft	windows_server	—	—
microsoft	windows_server_2016	—	—
microsoft	windows_server_2016	—	—
msrc	windows_10_version_1709_for_32-bit_systems	—	—
msrc	windows_10_version_1709_for_arm64-based_systems	—	—
msrc	windows_10_version_1709_for_x64-based_systems	—	—
msrc	windows_10_version_1803_for_32-bit_systems	—	—

Detection & IOCs extracted from sources · hover to see the quote

filename poc.otf↗

url https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47088.zip↗

• → Monitor calls to DWrite!AdobeCFF2Snapshot → DWrite!FontInstancer::InstanceCffTable → DWrite!FontInstancer::CreateInstanceInternal → DWrite!DWriteFontFace::CreateInstancedStream in the Edge renderer process; this call chain is the execution path for the vulnerability. ↗
• → The vulnerability is triggered when Microsoft Edge renders a page with an embedded OpenType variable font and the user initiates printing (to PDF, XPS, or a physical/virtual printer); detection should focus on print operations involving variable OTF fonts in Edge. ↗
• → The crash/exploit path goes through d2d1!dxc::TextConvertor::InstanceFontResources and d2d1!dxc::CXpsPrintControl::Close in the Edge renderer; access violations in DWrite!do_set_weight_vector_cube from this call stack are a strong indicator of exploitation. ↗
• → An access violation (code c0000005) in DWrite!do_set_weight_vector_cube+0x16a during Edge renderer activity is a direct crash signature for this CVE; look for this exception in crash telemetry or WER reports. ↗
• → The malicious font exploits the tx_SETWVN instruction with a negative nAxes value (e.g. -100000); OpenType variable fonts (.otf) containing a tx_SETWVN opcode with a negative operand should be flagged for analysis. ↗

• · The exploit path via CreateInstancedStream is only reachable through the Direct2D printing interface; the vulnerability requires a user to actively print a page containing the malicious variable font — passive browsing alone does not trigger it. ↗

CVSS provenance

nvd v3.0 8.8 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd v2.0 9.3 CRITICAL AV:N/AC:M/Au:N/C:C/I:C/A:C

vendor_msrc 7.8 HIGH

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