PT-2017-4019 · Mozilla+2 · Firefox+2

Oriol Brufau · Published 2017-07-04 · Updated 2024-12-12 · CVE-2017-7820

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 56

Description The issue is related to the "instanceof" operator, which can bypass the Xray wrapper mechanism. This allows web content to provide its own result for the operator, potentially tricking the browser or extension into mishandling the element. The vulnerability may be exploited by a remote attacker to impact data integrity.

Recommendations For versions prior to 56, update to a version 56 or later to resolve the issue. As a temporary workaround, consider restricting the use of the "instanceof" operator in web content to minimize the risk of exploitation.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2017-2437

ALT-PU-2018-1854

BDU:2021-00178

CVE-2017-7820

OPENSUSE-SU-2024:10600-1

OPENSUSE-SU-2024:14572-1

USN-3435-1

USN-3435-2

Affected Products

Alt Linux

Firefox

Ubuntu

References · 1896

• 🔥 https://bugzilla.mozilla.org/show_bug.cgi?id=1378207 · Exploit
• https://mozilla.org/en-US/security/advisories/mfsa2017-21 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:14572-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-7814 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-7818 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2017-21 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-7793 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-7822 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-7820 · Security Note
• https://ubuntu.com/security/CVE-2017-7815 · Vendor Advisory
• https://wiki.astralinux.ru/pages/viewpage.action?pageId=1212483 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-7820 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-00178 · Security Note
• https://ubuntu.com/security/CVE-2017-7816 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-7820 · Vendor Advisory