Background exploitation KEV catalog No authentication

CVE-2017-0022

Microsoft XML Core Services Information Disclosure Vulnerability

CheckOps priority index

5.5/10 Patch within 7 days

Severity6.5

Probability1.8

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 18.1% higher than 97.2% of CVEs

CVSS 3.1 6.5 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:

Exploited for 1,624 days 24 May 2022

CISA due date 14 Jun 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)24 May 2022
Exploited in EUVD (ENISA)24 May 2022
Used by ransomwareno
EPSS above 10 %18.1%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

Microsoft XML Core Services (MSXML) in Windows 10 Gold, 1511, and 1607; Windows 7 SP1; Windows 8.1; Windows RT 8.1; Windows Server 2008 SP2 and R2 SP1; Windows Server 2012 Gold and R2; Windows Server 2016; and Windows Vista SP2 improperly handles objects in memory, allowing attackers to test for files on disk via a crafted web site, aka "Microsoft XML Information Disclosure Vulnerability."

Affected products

XML Core Services

Affected versions

XML Core Services (MSXML) in Windows 10 Gold, 1511, and 1607; Windows 7 SP1; Windows 8.1; Windows RT 8.1; Windows Server 2008 SP2 and R2 SP1; Windows Server 2012 Gold and R2; Windows Server 2016; and Windows Vista SP2

Weaknesses (CWE)

CWE-200

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

17 Mar 2017
Published
24 May 2022
Exploitation reported (ENISA)
24 May 2022
Added to the KEV catalog
14 Jun 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 18.1%

References

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