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Advisories

FlashAttention Symlink Attack via tarfile.extractall in hopper/setup.py

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severity
medium
date
Affecting

  • FlashAttention <= 2.8.3.post1, fixed in commit 0816ef1

CWE
  • CWE-59 Improper Link Resolution Before File Access ('Link Following')
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
YU SUN
Description
FlashAttention through 2.8.3.post1, fixed in commit 0816ef1, contains a symlink attack vulnerability in the download_and_copy() function within hopper/setup.py that extracts NVIDIA toolchain archives without validating symlinks or filtering tar members. A local attacker can pre-plant a symlink in the predictable cache directory to redirect extracted binaries to an attacker-chosen location, enabling arbitrary file write with victim privileges during build time.

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