Thumbnails Documentation Advanced Security Guide Introduction Previous page: Thumbnails Index page: Documentation Next page: Advanced Security Guide Introduction File Indexing

Mitigate file parsing attack surface by not installing a file indexing service.

Indexing services parse content: A file indexing service does not only index file names, which is relatively simple. It typically also supports opening a large number of file formats (such as .cue (cue sheet metadata file), .pdf (Portable Document Format document), .epub (e-book file format), .docx (Microsoft Word document), .odt (OpenDocument text document)) and parses their content.
No indexing daemon: Not running an indexing service means that no daemon (long running process) keeps monitoring for new or changed files. ^[1]
Parses, does not execute: The indexing does not execute files, but it parses files.
Attack surface removed: By not installing an indexing service, the file parsing attack surface of that indexing service is removed.
Fewer background parsers: Also, in many cases, fewer background components will parse files automatically. Depending on the setup, other parsers may still exist.
- Exception: One exception might be Thumbnails but these are also disabled by default in Kicksecure.
Manual search is lower risk: Searching for files with tools such as find generally has a lower attack surface. find searches file names and filesystem metadata (such as paths, timestamps, sizes, and permissions). find does not parse file contents. find by default also does not execute files. If you use actions such as -exec, find will run a command that you explicitly specify. See footnote for further information. ^[2]
Real world example: For example, in case of 1-Click Remote Code Execution (RCE) on GNOME (CVE-2023-43641) in file indexing service, Kicksecure was unaffected by this specific attack chain.
- Same malicious file did not work: The same malicious file used to accomplish RCE in file indexing service GNOME tracker-miner, which used libcue to parse cue files, could not trigger that same attack chain in Kicksecure when the indexing service was not installed.
- Attack chain: What happened in case of GitHub Security Lab: Coordinated disclosure - 1-click RCE on GNOME (CVE-2023-43641) was: GNOME file indexing service -> saw a .cue file -> parsed it -> parser exploit -> RCE.
What libcue is:

libcue is a library used for parsing cue sheets, a metadata format for describing the layout of the tracks on a CD.

Low practical value: For most users today, indexing .cue "track layout" metadata is a niche feature. Cue sheets are mainly used for full-disc audio rips (for example a single large audio file plus a cue sheet), optical disc images (BIN/CUE), and some media players or emulators that want track level navigation or CD-Text style metadata. For typical desktop file search, this functionality is rarely essential. ^[3]
Mitigation summary: By not installing a file indexing service, this parsing attack surface is mitigated.
Not comparable to auto-execution: A file indexing service may parse files automatically in the background. By contrast, opening a file manually requires user action, and only the chosen application parses it. If no default handler is installed, opening a file may require choosing an application first.
Conclusion: Not installing a file indexing service removes a large file parsing attack surface. Manual tools such as find are generally safer because they operate on file names and metadata rather than parsing file contents.

Footnotes

↑ Technically, most indexing services try to avoid polling. On Linux, they will usually subscribe to filesystem change notifications (for example using inotify, often through higher level file monitor APIs) and do event based processing. Some configurations may still fall back to periodic scanning if event notifications are unavailable or unreliable.
↑
- What -exec does: find -exec runs a command that the user explicitly specifies and passes the found path(s) as arguments. This is useful for batch operations without any indexing daemon.
- Fix permissions: Batch-adjust permissions on matching files, for example: find . -type f -name '*.sh' -exec chmod 0700 -- {} +.
- Integrity checking: Generate hashes for matching files, for example: find . -type f -name '*.iso' -exec sha256sum -- {} +.
- Other maintenance tasks: Apply explicit user chosen operations such as changing ownership (chown), moving files (mv), or printing detailed listings (ls -ld) in a controlled way.
- What -exec does not do: -exec does not automatically execute the found files. The found files are treated as data, not as programs, unless the user explicitly chooses to run them as a program (for example -exec {} \;).
- Safety note: find -exec is powerful and can be dangerous if used incorrectly. This is a standard shell scripting feature, similar to programming, and for Advanced Users only.
- Safe usage guides: For safe instructions using find see Wooledge: Using find. See also Safely Using Find with End-Of-Options.
- Conclusion: find does not introduce the same attack surface as a file indexing service.
↑ See Wikipedia: Cue sheet (computing) (track layout metadata, audio playback use cases, BIN/CUE disc images), Kodi Wiki: Cue sheets (playlist and index information for large audio files), and OpenEmu Wiki: Cue Sheets (disc layout metadata for CD based images used by emulators).

Thumbnails Documentation Advanced Security Guide Introduction Previous page: Thumbnails Index page: Documentation Next page: Advanced Security Guide Introduction

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[1] Technically, most indexing services try to avoid polling. On Linux, they will usually subscribe to filesystem change notifications (for example using inotify, often through higher level file monitor APIs) and do event based processing. Some configurations may still fall back to periodic scanning if event notifications are unavailable or unreliable.

[2] 
What -exec does: find -exec runs a command that the user explicitly specifies and passes the found path(s) as arguments. This is useful for batch operations without any indexing daemon.

Fix permissions: Batch-adjust permissions on matching files, for example: find . -type f -name '*.sh' -exec chmod 0700 -- {} +.

Integrity checking: Generate hashes for matching files, for example: find . -type f -name '*.iso' -exec sha256sum -- {} +.

Other maintenance tasks: Apply explicit user chosen operations such as changing ownership (chown), moving files (mv), or printing detailed listings (ls -ld) in a controlled way.

What -exec does not do: -exec does not automatically execute the found files. The found files are treated as data, not as programs, unless the user explicitly chooses to run them as a program (for example -exec {} \;).

Safety note: find -exec is powerful and can be dangerous if used incorrectly. This is a standard shell scripting feature, similar to programming, and for Advanced Users only.

Safe usage guides: For safe instructions using find see Wooledge: Using find. See also Safely Using Find with End-Of-Options.

Conclusion: find does not introduce the same attack surface as a file indexing service.

[3] What -exec does: find -exec runs a command that the user explicitly specifies and passes the found path(s) as arguments. This is useful for batch operations without any indexing daemon.

[4] Fix permissions: Batch-adjust permissions on matching files, for example: find . -type f -name '*.sh' -exec chmod 0700 -- {} +.

[5] Integrity checking: Generate hashes for matching files, for example: find . -type f -name '*.iso' -exec sha256sum -- {} +.

[6] Other maintenance tasks: Apply explicit user chosen operations such as changing ownership (chown), moving files (mv), or printing detailed listings (ls -ld) in a controlled way.

[7] What -exec does not do: -exec does not automatically execute the found files. The found files are treated as data, not as programs, unless the user explicitly chooses to run them as a program (for example -exec {} \;).

[8] Safety note: find -exec is powerful and can be dangerous if used incorrectly. This is a standard shell scripting feature, similar to programming, and for Advanced Users only.

[9] Safe usage guides: For safe instructions using find see Wooledge: Using find. See also Safely Using Find with End-Of-Options.

[10] Conclusion: find does not introduce the same attack surface as a file indexing service.

[3] See Wikipedia: Cue sheet (computing) (track layout metadata, audio playback use cases, BIN/CUE disc images), Kodi Wiki: Cue sheets (playlist and index information for large audio files), and OpenEmu Wiki: Cue Sheets (disc layout metadata for CD based images used by emulators).

[1]

[2]

[3]

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