CVE-2021-3011610.0CriticalCWE-522

CVE-2021-30116: Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6

Kaseya · Virtual System/Server Administrator (VSA)

Fixed in 9.5.7 · Affected: Kaseya Virtual System/Server Administrator (VSA) before 9.5.7 · Exploitation: in CISA KEV since 3 Nov 2021

Known ransomware use

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

ExploitationIn CISA KEV

In CISA KEVCISA KEV catalogue3 Nov 2021
Exploited (reported): not seen
Scanning observed: not seen
Proof of concept public: not seen
Not established: not seen

85.7%probability of exploitation in the next 30 days

99th percentile

050100

Higher than 99% of scored CVEs

10.0CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\Program Files (x86)\Kaseya\XXXXXXXXXX\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813&pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system.

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalogue.
CISA KEV: Listed since 3 Nov 2021 · known ransomware use · catalogue entry
Public check: Kaseya VSA < 9.5.7 - Credential Disclosure via Windows Agent · nuclei template in projectdiscovery/nuclei-templates
Weakness: Insufficiently Protected Credentials · Authentication
Vendor: Kaseya
Published: July 2021
Band: Exploited in the wild, July 2021

What changed

5 Nov
CISA’s KEV entry now notes known ransomware use CISA
3 Nov 2021
CISA added it to the KEV catalogue CISA

CoverageNo articles yet

No CyberSIXT article names CVE-2021-30116 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.