PT-2018-17696 · Grammarly · Grammarly

Published 2018-02-06 · Updated 2019-10-03 · CVE-2018-6654

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Grammarly extension versions prior to 2018-02-02 for Chrome

Description The issue allows remote attackers to discover authentication tokens. This is achieved by sending an 'action: "user"' request to the "iframe.gr -ifr" endpoint, because the exposure of these tokens is not restricted to any specific web site.

Recommendations For Grammarly extension versions prior to 2018-02-02 for Chrome, consider updating to a version released after 2018-02-02 to resolve the issue. As a temporary workaround, consider restricting access to the "iframe.gr -ifr" endpoint to minimize the risk of exploitation.

Exploit

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2018-6654

Affected Products

Grammarly

References · 3

• 🔥 https://bugs.chromium.org/p/project-zero/issues/detail?id=1527 · Exploit
• https://osv.dev/vulnerability/CVE-2018-6654 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-6654 · Security Note