PT-2021-18613 · Kaseya · Kaseya Vsa

Frank Breedijk + 4 · Published 2021-07-09 · Updated 2022-04-29 · CVE-2021-30121

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Kaseya VSA versions prior to 9.5.6

Description The issue allows for semi-authenticated local file inclusion, where the contents of arbitrary files can be returned by the web server. A valid session ID is required but can be easily obtained. This can be exploited through a crafted request, such as visiting a specific URL with a manipulated path parameter, for example, https://x.x.x.x/KLC/js/Kaseya.SB.JS/js.aspx?path=C:KaseyaWebPagesdl.asp.

Recommendations For versions prior to 9.5.6, update to version 9.5.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the js.aspx endpoint until a patch is applied. Avoid using the path parameter in the affected API endpoint until the issue is resolved.

Exploit

Fix

Weakness Enumeration

CWE-829

Related Identifiers

CVE-2021-30121

Affected Products

Kaseya Vsa

References · 6

• 🔥 https://csirt.divd.nl/CVE-2021-30121 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-30121 · Security Note
• https://csirt.divd.nl/DIVD-2021-00011 · Patch
• https://osv.dev/vulnerability/CVE-2021-30121 · Vendor Advisory
• https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure · Patch
• https://t.me/cvenotify/17341 · Telegram Post