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pull/920/head
s1m0 3 years ago
parent c86a0ed4d5
commit 67a7d1726f
11 changed files with 1263 additions and 183 deletions
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  1. 43
      slither/detectors/statements/msg_value_in_loop.py
  2. 8
      tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol
  3. 271
      tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol.0.4.25.MsgValueInLoop.json
  4. 10
      tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol
  5. 271
      tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol.0.5.16.MsgValueInLoop.json
  6. 10
      tests/detectors/msg-value-loop/0.6.11/msg_value_loop.sol
  7. 271
      tests/detectors/msg-value-loop/0.6.11/msg_value_loop.sol.0.6.11.MsgValueInLoop.json
  8. 10
      tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol
  9. 271
      tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol.0.7.6.MsgValueInLoop.json
  10. 10
      tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol
  11. 271
      tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol.0.8.0.MsgValueInLoop.json

43
slither/detectors/statements/msg_value_in_loop.py
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@ -1,34 +1,40 @@
from slither.core.cfg.node import NodeType
from typing import List
from slither.core.cfg.node import NodeType, Node
from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
from slither.core.declarations import SolidityVariableComposed
from slither.slithir.operations import InternalCall
from slither.core.declarations import SolidityVariableComposed, Contract
from slither.utils.output import Output
def detect_msg_value_in_loop(contract):
results = []
for f in contract.functions + contract.modifiers:
def detect_msg_value_in_loop(contract: Contract) -> List[Node]:
results: List[Node] = []
for f in contract.functions_entry_points:
if f.is_implemented and f.payable:
msg_value_in_loop(f.entry_point, False, [], results)
msg_value_in_loop(f.entry_point, 0, [], results)
return results
def msg_value_in_loop(node, in_loop, visited, results):
def msg_value_in_loop(
node: Node, in_loop_counter: int, visited: List[Node], results: List[Node]
) -> None:
if node in visited:
return
# shared visited
visited.append(node)
if node.type == NodeType.STARTLOOP:
in_loop = True
in_loop_counter += 1
elif node.type == NodeType.ENDLOOP:
in_loop = False
in_loop_counter -= 1
if in_loop:
for ir in node.all_slithir_operations():
if SolidityVariableComposed("msg.value") in ir.read:
results.append(node)
for ir in node.all_slithir_operations():
if in_loop_counter > 0 and SolidityVariableComposed("msg.value") in ir.read:
results.append(ir.node)
if isinstance(ir, (InternalCall)):
msg_value_in_loop(ir.function.entry_point, in_loop_counter, visited, results)
for son in node.sons:
msg_value_in_loop(son, in_loop, visited, results)
msg_value_in_loop(son, in_loop_counter, visited, results)
class MsgValueInLoop(AbstractDetector):
@ -61,17 +67,16 @@ contract MsgValueInLoop{
}
```
When calling `bad` the same `msg.value` amount will be accredited multiple times."""
"""
# endregion wiki_exploit_scenario
WIKI_RECOMMENDATION = """
Don't use `msg.value` inside a loop.
If you need to use it inside a loop save the `msg.value` to a local variable and use it as a cache (subtract the amount used from it)
Track msg.value through a local variable and decrease its amount on every iteration/usage.
"""
def _detect(self):
def _detect(self) -> List[Output]:
""""""
results = []
results: List[Output] = []
for c in self.compilation_unit.contracts_derived:
values = detect_msg_value_in_loop(c)
for node in values:

8
tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol
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@ -18,4 +18,12 @@ contract C{
balances[a] += msg.value;
}
function bad3(address[] memory receivers) public payable {
for (uint256 i = 0; i < 2; i++) {
for (uint256 j = 0; j < receivers.length; j++) {
balances[receivers[j]] += msg.value;
}
}
}
}

271
tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol.0.4.25.MsgValueInLoop.json
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@ -29,7 +29,7 @@
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"filename_used": "/GENERIC_PATH",
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@ -57,7 +57,15 @@
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@ -111,7 +119,7 @@
"name": "C",
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@ -139,7 +147,15 @@
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@ -163,21 +179,19 @@
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@ -188,7 +202,7 @@
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"filename_used": "/GENERIC_PATH",
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@ -216,50 +230,235 @@
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},
"signature": "bad2(address[])"
"signature": "bad2_internal(address)"
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"markdown": "[C.bad2_internal(address)](tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol#L17-L19) use msg.value in a loop: [balances[a] += msg.value](tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol#L18)\n",
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@ -270,7 +469,7 @@
"name": "C",
"source_mapping": {
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"filename_used": "/GENERIC_PATH",
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@ -298,22 +497,30 @@
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"markdown": "[C.bad2(address[])](tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol#L11-L15) use msg.value in a loop: [bad2_internal(receivers[i])](tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol#L13)\n",
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"markdown": "[C.bad3(address[])](tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol#L21-L27) use msg.value in a loop: [balances[receivers[j]] += msg.value](tests/detectors/msg-value-loop/0.4.25/msg_value_loop.sol#L24)\n",
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"id": "91bc78ce47280ec59296ebb0cf98afb5ede603b3c31025002c1c2ec1b940ad68",
"check": "msg-value-loop",
"impact": "High",
"confidence": "Medium"

10
tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol
Unescape View File

@ -8,7 +8,7 @@ contract C{
}
}
function bad2(address[] memory receivers) public payable {
function bad2(address[] memory receivers) public payable {
for (uint256 i = 0; i < receivers.length; i++) {
bad2_internal(receivers[i]);
}
@ -18,4 +18,12 @@ contract C{
balances[a] += msg.value;
}
function bad3(address[] memory receivers) public payable {
for (uint256 i = 0; i < 2; i++) {
for (uint256 j = 0; j < receivers.length; j++) {
balances[receivers[j]] += msg.value;
}
}
}
}

271
tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol.0.5.16.MsgValueInLoop.json
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@ -29,7 +29,7 @@
"name": "C",
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"length": 511,
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"filename_used": "/GENERIC_PATH",
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@ -57,7 +57,15 @@
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@ -111,7 +119,7 @@
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"markdown": "[C.bad2(address[])](tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol#L11-L15) use msg.value in a loop: [bad2_internal(receivers[i])](tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol#L13)\n",
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"markdown": "[C.bad3(address[])](tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol#L21-L27) use msg.value in a loop: [balances[receivers[j]] += msg.value](tests/detectors/msg-value-loop/0.5.16/msg_value_loop.sol#L24)\n",
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10
tests/detectors/msg-value-loop/0.6.11/msg_value_loop.sol
Unescape View File

@ -8,7 +8,7 @@ contract C{
}
}
function bad2(address[] memory receivers) public payable {
function bad2(address[] memory receivers) public payable {
for (uint256 i = 0; i < receivers.length; i++) {
bad2_internal(receivers[i]);
}
@ -18,4 +18,12 @@ contract C{
balances[a] += msg.value;
}
function bad3(address[] memory receivers) public payable {
for (uint256 i = 0; i < 2; i++) {
for (uint256 j = 0; j < receivers.length; j++) {
balances[receivers[j]] += msg.value;
}
}
}
}

271
tests/detectors/msg-value-loop/0.6.11/msg_value_loop.sol.0.6.11.MsgValueInLoop.json
Unescape View File

@ -29,7 +29,7 @@
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"impact": "High",
"confidence": "Medium"

10
tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol
Unescape View File

@ -8,7 +8,7 @@ contract C{
}
}
function bad2(address[] memory receivers) public payable {
function bad2(address[] memory receivers) public payable {
for (uint256 i = 0; i < receivers.length; i++) {
bad2_internal(receivers[i]);
}
@ -18,4 +18,12 @@ contract C{
balances[a] += msg.value;
}
function bad3(address[] memory receivers) public payable {
for (uint256 i = 0; i < 2; i++) {
for (uint256 j = 0; j < receivers.length; j++) {
balances[receivers[j]] += msg.value;
}
}
}
}

271
tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol.0.7.6.MsgValueInLoop.json
Unescape View File

@ -29,7 +29,7 @@
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"filename_absolute": "/GENERIC_PATH",
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@ -270,7 +469,7 @@
"name": "C",
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"filename_used": "/GENERIC_PATH",
"filename_relative": "tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol",
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@ -298,22 +497,30 @@
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"signature": "bad2(address[])"
"signature": "bad3(address[])"
}
}
}
}
],
"description": "C.bad2(address[]) (tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#11-15) use msg.value in a loop: bad2_internal(receivers[i]) (tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#13)\n",
"markdown": "[C.bad2(address[])](tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#L11-L15) use msg.value in a loop: [bad2_internal(receivers[i])](tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#L13)\n",
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"id": "0fec821a1c77be9b94a219d21c9c2795cee09a25271cc47ea1ea68156c9cddff",
"description": "C.bad3(address[]) (tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#21-27) use msg.value in a loop: balances[receivers[j]] += msg.value (tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#24)\n",
"markdown": "[C.bad3(address[])](tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#L21-L27) use msg.value in a loop: [balances[receivers[j]] += msg.value](tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#L24)\n",
"first_markdown_element": "tests/detectors/msg-value-loop/0.7.6/msg_value_loop.sol#L21-L27",
"id": "9a021823637092277317750625e1f63b1b6f4b394a5dd1fdde50088af8d9e805",
"check": "msg-value-loop",
"impact": "High",
"confidence": "Medium"

10
tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol
Unescape View File

@ -8,7 +8,7 @@ contract C{
}
}
function bad2(address[] memory receivers) public payable {
function bad2(address[] memory receivers) public payable {
for (uint256 i = 0; i < receivers.length; i++) {
bad2_internal(receivers[i]);
}
@ -18,4 +18,12 @@ contract C{
balances[a] += msg.value;
}
function bad3(address[] memory receivers) public payable {
for (uint256 i = 0; i < 2; i++) {
for (uint256 j = 0; j < receivers.length; j++) {
balances[receivers[j]] += msg.value;
}
}
}
}

271
tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol.0.8.0.MsgValueInLoop.json
Unescape View File

@ -29,7 +29,7 @@
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"filename_relative": "tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol",
"filename_absolute": "/GENERIC_PATH",
@ -57,7 +57,15 @@
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@ -111,7 +119,7 @@
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"filename_used": "/GENERIC_PATH",
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@ -163,21 +179,19 @@
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@ -188,7 +202,7 @@
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@ -216,50 +230,235 @@
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"markdown": "[C.bad2_internal(address)](tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L17-L19) use msg.value in a loop: [balances[a] += msg.value](tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L18)\n",
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"check": "msg-value-loop",
"impact": "High",
"confidence": "Medium"
},
{
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@ -270,7 +469,7 @@
"name": "C",
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@ -298,22 +497,30 @@
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],
"description": "C.bad2(address[]) (tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#11-15) use msg.value in a loop: bad2_internal(receivers[i]) (tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#13)\n",
"markdown": "[C.bad2(address[])](tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L11-L15) use msg.value in a loop: [bad2_internal(receivers[i])](tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L13)\n",
"first_markdown_element": "tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L11-L15",
"id": "36cc43f938a3f57751ebb390fb30f8cc20a3f80634af3bab797d6b97feadf103",
"description": "C.bad3(address[]) (tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#21-27) use msg.value in a loop: balances[receivers[j]] += msg.value (tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#24)\n",
"markdown": "[C.bad3(address[])](tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L21-L27) use msg.value in a loop: [balances[receivers[j]] += msg.value](tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L24)\n",
"first_markdown_element": "tests/detectors/msg-value-loop/0.8.0/msg_value_loop.sol#L21-L27",
"id": "5aba5d0fecd0935e1e8d98c5779a7114fbfd4587b6b8b7fdca61829d3322f584",
"check": "msg-value-loop",
"impact": "High",
"confidence": "Medium"

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