19 lines
963 B
Text
19 lines
963 B
Text
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rule VULN_Dell_BIOS_Update_Driver_DBUtil_May21 {
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meta:
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description = "Detects vulnerable DELL BIOS update driver that allows privilege escalation as reported in CVE-2021-21551 - DBUtil_2_3.Sys - note: it's usual location is in the C:\\Windows\\Temp folder"
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author = "Florian Roth (Nextron Systems)"
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reference = "https://labs.sentinelone.com/cve-2021-21551-hundreds-of-millions-of-dell-computers-at-risk-due-to-multiple-bios-driver-privilege-escalation-flaws/"
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date = "2021-05-05"
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score = 60
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hash1 = "0296e2ce999e67c76352613a718e11516fe1b0efc3ffdb8918fc999dd76a73a5"
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hash2 = "ddbf5ecca5c8086afde1fb4f551e9e6400e94f4428fe7fb5559da5cffa654cc1"
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id = "6d46866e-40fb-5fbf-b159-6bf688e638cb"
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strings:
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$s1 = "\\DBUtilDrv2" ascii
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$s2 = "DBUtil_2_3.Sys" ascii fullword
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$s3 = "[ Dell BIOS Utility Driver - " ascii fullword
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condition:
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uint16(0) == 0x5a4d and filesize < 50KB and all of them
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}
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