CVE-2018-6548 Information

Description

A use-after-free issue was discovered in libwebm through 2018-02-02. If a Vp9HeaderParser was initialized once before its property frame_ would not be changed because of code in vp9parser::Vp9HeaderParser::SetFrame. Its frame_ could be freed while the corresponding pointer would not be updated leading to a dangling pointer. This is related to the function OutputCluster in webm_info.cc.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://bugs.chromium.org/p/webm/issues/detail?id=1493 https://github.com/dwfault/PoCs/blob/master/libwebm20Vp9HeaderParser20UAF20by20PrintVP9Info/libwebm20Vp9HeaderParser20UAF20by20PrintVP9Info.md

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8