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Exploited vulnerability · CISA KEV

Is CVE-2020-0787 exploited? Yes: in CISA KEV since 28 Jan 2022

Gociux · Microsoft Windows · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-0787, Microsoft Windows Background Intelligent Transfer Service (BITS) Improper Privilege Management Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 28 Jan 2022, 687 days after it was published. It is known to be used in ransomware campaigns. It affects Microsoft Windows. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 28 Jan 2022
ransomwareKnownused in campaigns
EPSStop 5%very likely to be exploited
severity7.8CVSS 3.1 · high
US federal due28 Jul 2022BOD 22-01 deadline

What it is

Microsoft Windows BITS is vulnerable to to a privilege elevation vulnerability if it improperly handles symbolic links. An actor can exploit this vulnerability to execute arbitrary code with system-level privileges.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductWindows
VulnerabilityMicrosoft Windows Background Intelligent Transfer Service (BITS) Improper Privilege Management Vulnerability
WeaknessCWE-269, CWE-59
Published12 Mar 2020
Added to KEV28 Jan 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Windows in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 12 Mar 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Windows

References

Questions

Is CVE-2020-0787 being exploited?

Yes. CISA added CVE-2020-0787 to the Known Exploited Vulnerabilities catalog on 28 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-0787 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2020-0787?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Windows and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in January 2022 · Microsoft scorecard · act-now radar.

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