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fix: Validate archive entry paths when unpacking EXECUTION_ENV_PATH #437

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Merged
pskiran1 merged 2 commits into from
Jun 2, 2026
Merged

fix: Validate archive entry paths when unpacking EXECUTION_ENV_PATH #437

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cc04274
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pskiran1 May 20, 2026
107a7d3
Update src/pb_env.cc
pskiran1 May 28, 2026
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19 changes: 16 additions & 3 deletions src/pb_env.cc
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright (c) 2021-2022, NVIDIA CORPORATION. All rights reserved.
// Copyright (c) 2021-2026, NVIDIA CORPORATION. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
Expand Down Expand Up @@ -115,11 +115,24 @@ ExtractTarFile(std::string& archive_path, std::string& dst_path)
}

struct archive_entry* entry;
int flags = ARCHIVE_EXTRACT_TIME;
// Reject archive entries that could write outside of `dst_path`.
// This includes:
// - Parent directory traversal (e.g., "../")
// - Absolute paths
// - Writes through symlinks present in the archive
int flags = ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_SECURE_NODOTDOT |
ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS |
ARCHIVE_EXTRACT_SECURE_SYMLINKS;

struct archive* input_archive = archive_read_new();
struct archive* output_archive = archive_write_disk_new();
archive_write_disk_set_options(output_archive, flags);
if (archive_write_disk_set_options(output_archive, flags) != ARCHIVE_OK) {
std::string err = std::string("archive_write_disk_set_options() failed: ") +
archive_error_string(output_archive);
archive_read_free(input_archive);
archive_write_free(output_archive);
throw PythonBackendException(err);
}

archive_read_support_filter_gzip(input_archive);
archive_read_support_format_tar(input_archive);
Expand Down
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