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Exploited vulnerability · CISA KEV

Is CVE-2023-7101 exploited? Yes: in CISA KEV since 2 Jan 2024

Gociux · Spreadsheet::ParseExcel · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-7101, Spreadsheet::ParseExcel Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Jan 2024, 9 days after it was published. It affects Spreadsheet::ParseExcel. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 2 Jan 2024
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.8CVSS 3.1 · high
US federal due23 Jan 2024BOD 22-01 deadline

What it is

Spreadsheet::ParseExcel contains a remote code execution vulnerability due to passing unvalidated input from a file into a string-type “eval”. Specifically, the issue stems from the evaluation of Number format strings within the Excel parsing logic.

VendorSpreadsheet::ParseExcel (1 exploited CVE in KEV)
ProductSpreadsheet::ParseExcel
VulnerabilitySpreadsheet::ParseExcel Remote Code Execution Vulnerability
WeaknessCWE-95
Published24 Dec 2023
Added to KEV2 Jan 2024
Reported by (CNA)Mandiant

What to do

  1. Check whether you run it. Look for Spreadsheet::ParseExcel in your asset inventory, including appliances and cloud images. Stack check lists every exploited Spreadsheet::ParseExcel CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  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 24 Dec 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Spreadsheet::ParseExcel.

References

Questions

Is CVE-2023-7101 being exploited?

Yes. CISA added CVE-2023-7101 to the Known Exploited Vulnerabilities catalog on 2 Jan 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-7101 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2023-7101?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Spreadsheet::ParseExcel's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Spreadsheet::ParseExcel 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 2024 · act-now radar.

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