65 lines
2.2 KiB
Text
65 lines
2.2 KiB
Text
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rule LOG_EXPL_SharePoint_CVE_2023_29357_Sep23_1 {
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meta:
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description = "Detects log entries that could indicate a successful exploitation of CVE-2023-29357 on Microsoft SharePoint servers with the published Python POC"
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author = "Florian Roth (with help from @LuemmelSec)"
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reference = "https://twitter.com/Gi7w0rm/status/1706764212704591953?s=20"
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date = "2023-09-28"
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modified = "2023-10-01"
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score = 70
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id = "9fa77216-c0d6-55e5-bbcc-adb9438ca456"
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strings:
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/*
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references:
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https://x.com/TH3C0DEX/status/1707503935596925048?s=20
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https://x.com/theluemmel/status/1707653715627311360?s=20 (plus private chat)
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*/
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$xr1 = /GET [a-z\.\/_]{0,40}\/web\/(siteusers|currentuser) - (80|443) .{10,200} (python-requests\/[0-9\.]{3,8}|-) [^ ]{1,160} [^4]0[0-9] /
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condition:
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$xr1
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}
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rule HKTL_EXPL_POC_PY_SharePoint_CVE_2023_29357_Sep23_1 {
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meta:
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description = "Detects a Python POC to exploit CVE-2023-29357 on Microsoft SharePoint servers"
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author = "Florian Roth"
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reference = "https://github.com/Chocapikk/CVE-2023-29357"
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date = "2023-10-01"
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modified = "2023-10-01"
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score = 80
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id = "2be524ab-f360-56b8-9ce3-e15036855c67"
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strings:
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$x1 = "encoded_payload = base64.urlsafe_b64encode(json.dumps(payload).encode()).rstrip(b'=')"
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condition:
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filesize < 30KB and $x1
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}
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rule HKTL_EXPL_POC_NET_SharePoint_CVE_2023_29357_Sep23_1 {
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meta:
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description = "Detects a C# POC to exploit CVE-2023-29357 on Microsoft SharePoint servers"
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author = "Florian Roth"
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reference = "https://github.com/LuemmelSec/CVE-2023-29357"
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date = "2023-10-01"
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score = 80
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id = "aa6aeb00-b162-538c-a670-cbff525dd8f1"
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strings:
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$x1 = "{f22d2de0-606b-4d16-98d5-421f3f1ba8bc}" ascii wide
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$x2 = "{F22D2DE0-606B-4D16-98D5-421F3F1BA8BC}" ascii wide
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$s1 = "Bearer"
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$s2 = "hashedprooftoken"
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$s3 = "/_api/web/"
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$s4 = "X-PROOF_TOKEN"
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$s5 = "00000003-0000-0ff1-ce00-000000000000"
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$s6 = "IsSiteAdmin"
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condition:
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uint16(0) == 0x5a4d
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and filesize < 800KB
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and (
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1 of ($x*)
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or all of ($s*)
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)
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}
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