CVE-2021-38503 Information

Description

The iframe sandbox rules were not correctly applied to XSLT stylesheets allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94 Thunderbird < 91.3 and Firefox ESR < 91.3.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Reference

https://www.mozilla.org/security/advisories/mfsa2021-50/ https://bugzilla.mozilla.org/show_bug.cgi?id=1729517 https://www.mozilla.org/security/advisories/mfsa2021-49/ https://www.mozilla.org/security/advisories/mfsa2021-48/ https://www.debian.org/security/2021/dsa-5026 https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html https://www.debian.org/security/2022/dsa-5034 https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html https://security.gentoo.org/glsa/202202-03

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

10.0