{"id":"CVE-2025-4134","state":"PUBLISHED","title":"Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files","description":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.","publishedAt":"2025-05-28T13:53:26.499Z","updatedAt":"2025-05-28T14:06:40.254Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","source":"NLOK"},"assigner":"NLOK","products":["Avast Avast Business Antivirus"],"affected":[{"vendor":"Avast","product":"Avast Business Antivirus","defaultStatus":"unaffected","versions":[{"version":"4.5.1","status":"affected","versionType":"customLack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files."}],"platforms":["Linux"]}],"references":["https://www.gendigital.com/us/en/contact-us/security-advisories/"],"weaknesses":["CWE-552"],"ingestedAt":"2026-10-29T20:09:23.771Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/4xxx/CVE-2025-4134.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-4134","state":"PUBLISHED","datePublished":"2025-05-28T13:53:26.499Z","dateUpdated":"2025-05-28T14:06:40.254Z","assignerShortName":"NLOK","assignerOrgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","dateReserved":"2025-04-30T12:38:11.230Z"},"containers":{"cna":{"title":"Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files","descriptions":[{"lang":"en","value":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write."}],"affected":[{"vendor":"Avast","product":"Avast Business Antivirus","defaultStatus":"unaffected","versions":[{"version":"4.5.1","status":"affected","versionType":"customLack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files."}],"platforms":["Linux"]}],"references":[{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/"}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-552","description":"CWE-552 Files or Directories Accessible to External Parties","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"NLOK","orgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","dateUpdated":"2025-05-28T13:53:33.351Z"},"credits":[{"lang":"en","type":"reporter","value":"FIS Securtiy"},{"lang":"en","type":"finder","value":"Nông Hoàng Tú"}],"impacts":[{"capecId":"CAPEC-148","descriptions":[{"lang":"en","value":"CAPEC-148 Content Spoofing"}]}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Fixed in V4.6 released 03/FEB/2025, ugrade to latest version."}],"value":"Fixed in V4.6 released 03/FEB/2025, ugrade to latest version."}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-05-28T14:06:29.597667Z","id":"CVE-2025-4134","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-05-28T14:06:40.254Z"}}]}}}