16 results · Feed
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High 8.8
Fickling MLAllowlist analysis pass rendered inoperative by shared mutable state in AnalysisContext.shorten_code()
In Trail of Bits fickling versions up to and including 0.1.11, the UnsafeImportsML analysis pass unconditionally calls AnalysisContext.shorten_code(node) on every import node it inspects, regardless of whether the import is flagged as unsafe. This call regist…
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High 8.8
Fickling check_safety() bypass via unlisted standard library modules (_posixsubprocess, site, atexit)
Trail of Bits fickling versions up to and including 0.1.10 do not include the Python standard library modules _posixsubprocess, site, and atexit in the UNSAFE_IMPORTS denylist (fickle.py). Because these modules are absent from the denylist, fickling's check_s…
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Medium —
fickling's `platform` module subprocess invocation evades `check_safety()` with `LIKELY_SAFE`
# Our assessment We added `platform` to the blocklist of unsafe modules (https://github.com/trailofbits/fickling/commit/351ed4d4242b447c0ffd550bb66b40695f3f9975). It was not possible to inject extra arguments to `file` without first monkey-patching `platform.…
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Medium —
fickling modules linecache, difflib and gc are missing from the unsafe modules blocklist
# Our analysis As stated in the [project's security policy](https://github.com/trailofbits/fickling/security/policy), we also don't consider `UnusedVariables` bypasses to be security issues. We added several unsafe modules mentioned by the reporter in advisor…
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High —
Fickling missing RCE-capable modules in UNSAFE_IMPORTS
# Assessment The modules `uuid`, `_osx_support` and `_aix_support` were added to the blocklist of unsafe imports (https://github.com/trailofbits/fickling/commit/ffac3479dbb97a7a1592d85991888562d34dd05b). # Original report ## Summary fickling's `UNSAFE_IMPORTS…
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High —
Fickling has `always_check_safety()` bypass: pickle.loads and _pickle.loads remain unhooked
# Assessment The missing pickle entrypoints `pickle.loads`, `_pickle.loads`, and `_pickle.load` were added to the hook https://github.com/trailofbits/fickling/commit/8c24c6edabceab156cfd41f4d70b650e1cdad1f7. # Original report ## Summary `fickling.always_check…
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Medium —
Fickling has safety check bypass via REDUCE+BUILD opcode sequence
# Assessment It is believed that the analysis pass works as intended, `REDUCE` and `BUILD` are not at fault here. The few potentially unsafe modules have been added to the blocklist (https://github.com/trailofbits/fickling/commit/0c4558d950daf70e134090573450d…
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High —
Fickling: OBJ opcode call invisibility bypasses all safety checks
# Assessment The interpreter so it behaves closer to CPython when dealing with `OBJ`, `NEWOBJ`, and `NEWOBJ_EX` opcodes (https://github.com/trailofbits/fickling/commit/ff423dade2bb1f72b2b48586c022fac40cbd9a4a). # Original report ## Summary All 5 of fickling's…
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Low —
Fickling has a detection bypass via stdlib network-protocol constructors
# Our assessment `imtplib`, `imaplib`, `ftplib`, `poplib`, `telnetlib`, and `nntplib` were added to the list of unsafe imports (https://github.com/trailofbits/fickling/commit/6d20564d23acf14b42ec883908aed159be7b9ade). The `UnusedVariables` heuristic works as …
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High 8.9
Fickling vulnerable to detection bypass due to "builtins" blindness
Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, Fickling is vulnerable to detection bypass due to "builtins" blindness. This issue has been patched in version 0.1.7.
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High 8.9
Fickling has Static Analysis Bypass via Incomplete Dangerous Module Blocklist
Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, the unsafe_imports() method in Fickling's static analyzer fails to flag several high-risk Python modules that can be used for arbitrary code execution. Malicious pickles imp…
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High 8.9
Fickling vulnerable to use of ctypes and pydoc gadget chain to bypass detection
Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, both ctypes and pydoc modules aren't explicitly blocked. Even other existing pickle scanning tools (like picklescan) do not block pydoc.locate. Chaining these two together c…
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High 8.9
Fickling Blocklist Bypass: cProfile.run()
Fickling is a Python pickling decompiler and static analyzer. Fickling versions up to and including 0.1.6 do not treat Python's cProfile module as unsafe. Because of this, a malicious pickle that uses cProfile.run() is classified as SUSPICIOUS instead of OVER…
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High 8.9
Fickling has a bypass via runpy.run_path() and runpy.run_module()
Fickling is a Python pickling decompiler and static analyzer. Fickling versions up to and including 0.1.6 do not treat Python’s runpy module as unsafe. Because of this, a malicious pickle that uses runpy.run_path() or runpy.run_module() is classified as SUSPI…
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High 7.1
Fickling has Code Injection vulnerability via pty.spawn()
Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 had a bypass caused by `pty` missing from the block list of unsafe module imports. This led to unsafe pickles based on `pty.spawn()` being incorrectly flagged as `LIKELY_SAF…
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High 7.1
Fickling has missing detection for marshal.loads and types.FunctionType in unsafe modules list
Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 are missing `marshal` and `types` from the block list of unsafe module imports. Fickling started blocking both modules to address this issue. This allows an attacker to craf…