cbcvebase.
CVE-2017-7041
published 2017-07-20

CVE-2017-7041: An issue was discovered in certain Apple products. iOS before 10.3.3 is affected. Safari before 10.1.2 is affected. iCloud before 6.2.2 on Windows is affected…

PriorityP264high8.8CVSS 3.0
AVNACLPRNUIRSUCHIHAH
EXPLOIT
EPSS
9.50%
94.9th percentile
An issue was discovered in certain Apple products. iOS before 10.3.3 is affected. Safari before 10.1.2 is affected. iCloud before 6.2.2 on Windows is affected. iTunes before 12.6.2 on Windows is affected. tvOS before 10.2.2 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

Affected

11 ranges
VendorProductVersion rangeFixed in
appleicloud< 6.2.26.2.2
appleicloud_for_windows
appleios
appleiphone_os< 10.3.310.3.3
appleitunes< 12.6.212.6.2
appleitunes_12.6.2_for_windows
applesafari< 10.1.210.1.2
applesafari
appletvos< 10.2.210.2.2
appletvos
debianwebkit2gtk< webkit2gtk 2.16.3-2 (bookworm)webkit2gtk 2.16.3-2 (bookworm)

Detection & IOCsextracted from sources · hover to see the quote

command* { -webkit-flow-into: textarea; }
  • Vulnerability is a Use-After-Free in WebCore::Node::getFlag triggered by crafted web content using CSS -webkit-flow-into property combined with JavaScript GC pressure (freememory function loop)
  • Crash occurs during JSC garbage collector sweep (MarkedBlock::Handle::specializedSweep) after Node object is freed; look for UAF patterns involving WebCore::Node destruction during JS GC cycles triggered by page load
  • Exploit PoC uses CSS named flow (-webkit-flow-into: textarea) combined with JavaScript memory pressure loops to trigger the UAF; detect pages combining -webkit-flow-into CSS with aggressive JS allocation loops
  • UAF originates from WebCore::Node operator new allocation of HTMLDivElement subsequently freed and accessed via WebCore::Node::getFlag during document wrapper creation (WebCore::JSDOMWindowBase::updateDocument)
  • ·Exploit PoC was developed and tested against a local WebKit build (WebKitBuild/Release); offsets and stack frames are specific to that build and not directly portable to production Apple binaries
  • ·Affected products span multiple platforms (iOS, Safari, iCloud for Windows, iTunes for Windows, tvOS); patched versions are iOS 10.3.3, Safari 10.1.2, iCloud for Windows 6.2.2, iTunes 12.6.2, tvOS 10.2.2 — detection should cover all WebKit-based surfaces

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
osv8.8HIGH
vendor_debian8.8LOW
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