T09 · Insecure Skill Coding Practices
- Location
scripts/note.sh:21- Finding
Unrestricted grep arguments allow access outside the notes directory
- Content
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Vulnerability Details
File Location:
scripts/note.sh, lines 21–23
Vulnerability Type: Improper argument handling and missing option termination
Risk Level: MediumVulnerable Code
bash search) shift grep -r "$@" "$NOTES_DIR" 2>/dev/null || echo "未找到相关笔记" ;;Technical Analysis
The script expands
"$@"into multiple independent arguments and passes them directly togrep. Consequently, user-supplied arguments are not constrained to a single search pattern. Additional arguments can be interpreted as file or directory operands, while arguments beginning with-can be interpreted asgrepoptions.Although shell metacharacters inside the arguments are not re-evaluated as shell syntax, this argument-injection flaw permits the caller to change the intended scope and behavior of
grep. The command also omits the--option terminator needed to ensure that an option-like pattern is handled as data.Attack Path
- An attacker supplies or induces a search request containing a search term followed by a local path, such as
note search keyword /path/to/readable/file. - The
searchbranch removes only the subcommand withshift. "$@"expands the search term and attacker-selected path into separategreparguments.greptreats the additional path as another input operand and searches it alongside~/.quick-notes.- Any matching lines from the readable external file are emitted to standard output and may be returned to the caller.
Option-like arguments may similarly modify
grepbehavior because option parsing is not explicitly terminated.Impact Assessment
A caller can cause the Skill to inspect files and directories outside its documented
~/.quick-notesstorage scope. The accessible scope is limited to files readable by the operating-system account running the Skill; this issue does not itself grant elevated privileges. Nevertheless, matching con ...[truncated 120 chars]- An attacker supplies or induces a search request containing a search term followed by a local path, such as
- Remediation
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Remediation Suggestions
Enforce the expected argument count, terminate option parsing, and pass exactly one search pattern to
grep:bash search) shift if [ "$#" -ne 1 ]; then echo "Usage: note search <keyword>" >&2 exit 1 fi grep -r -- "$1" "$NOTES_DIR" 2>/dev/null || echo "No matching notes found" ;;If multi-word searches must be accepted as separate command-line arguments, deliberately combine them into one pattern before invoking
grep, then pass only that pattern after--. Also reject unexpected extra path operands and consider usinggrep -rF --when literal rather than regular-expression matching is intended.