PT-2018-9333 · Erusev · Parsedown

Aidantwoods · Published 2018-04-18 · Updated 2022-03-30 · CVE-2018-1000162

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Parsedown versions prior to 1.7.0

Description The issue concerns a Cross Site Scripting (XSS) vulnerability in the setMarkupEscaped function for escaping HTML, which can result in JavaScript code execution. This can be exploited via specially crafted markdown that allows it to bypass HTML escaping by breaking Abstract Syntax Tree (AST) boundaries.

Recommendations For versions prior to 1.7.0, update to version 1.7.0 or later to resolve the issue. As a temporary workaround, consider restricting the use of the setMarkupEscaped function until a patch is available. Avoid using specially crafted markdown that can break AST boundaries in the affected function until the issue is resolved.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2018-1000162

GHSA-QGPV-86R3-87FH

Affected Products

Parsedown

References · 7

• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/erusev/parsedown/CVE-2018-1000162.yaml · Exploit
• https://osv.dev/vulnerability/CVE-2018-1000162 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-qgpv-86r3-87fh · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-1000162 · Security Note
• https://github.com/erusev/parsedown · Note
• https://github.com/erusev/parsedown/pull/495 · Note
• https://github.com/Roave/SecurityAdvisories/issues/44#issuecomment-368594409 · Note