The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and WebKitGTK+ through 2.22.6 and other products, does not prevent the script dialog size from exceeding the web view size, which allows remote attackers to cause a denial of service (Buffer Overflow) or possibly have unspecified other impact, related to UIProcess/API/gtk/WebKitScriptDialogGtk.cpp, UIProcess/API/gtk/WebKitScriptDialogImpl.cpp, and UIProcess/API/gtk/WebKitWebViewGtk.cpp, as demonstrated by GNOME Web (aka Epiphany).
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://trac.webkit.org/changeset/241515/webkit | patch vendor advisory |
| https://www.exploit-db.com/exploits/46465/ | third party advisory vdb entry exploit |
| https://github.com/WebKit/webkit/commit/6f9b511a115311b13c06eb58038ddc2c78da5531 | third party advisory patch |
| https://www.inputzero.io/2019/02/fuzzing-webkit.html | third party advisory exploit |
| https://bugs.webkit.org/show_bug.cgi?id=184875 | third party advisory issue tracking permissions required |
| http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00058.html | vendor advisory mailing list third party advisory |
| https://usn.ubuntu.com/3948-1/ | third party advisory vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00005.html | vendor advisory mailing list third party advisory |