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Make text4shell datascript faster #22

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Make text4shell datascript faster #22

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34 changes: 18 additions & 16 deletions security/check_for_text4shell_attacks.md
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Original file line number Diff line number Diff line change
Expand Up @@ -11,23 +11,25 @@ in application profile.
-- detect CVE-2022-42889 Text4shell
local function check_for_attack (location, value)
if type(value) == "string" then
lower = string.lower(value)
if string.contains(lower, "${script:") then
avi.vs.log("CVE-2022-42889 Text4shell attack detected at " .. location)
avi.http.response(400)
end
if string.contains(lower, "${dns:") then
avi.vs.log("CVE-2022-42889 Text4shell attack detected at " .. location)
avi.http.response(400)
end
if string.contains(lower, "${url:") then
avi.vs.log("CVE-2022-42889 Text4shell attack detected at " .. location)
avi.http.response(400)
end
-- detect evasion
if string.match(lower, "${%a*${") then
avi.vs.log("CVE-2022-42889 Text4shell attack (evasion attempt) detected at " .. location)
if string.contains(value, "${") then
lower = string.lower(value)
if string.contains(lower, "${script:") then
avi.vs.log("CVE-2022-42889 Text4shell attack detected at " .. location)
avi.http.response(400)
end
if string.contains(lower, "${dns:") then
avi.vs.log("CVE-2022-42889 Text4shell attack detected at " .. location)
avi.http.response(400)
end
if string.contains(lower, "${url:") then
avi.vs.log("CVE-2022-42889 Text4shell attack detected at " .. location)
avi.http.response(400)
end
-- detect evasion
if string.match(lower, "${%a*${") then
avi.vs.log("CVE-2022-42889 Text4shell attack (evasion attempt) detected at " .. location)
avi.http.response(400)
end
end
end
end
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