🔒 Fix missing end-of-options indicator in grep command#38
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Co-authored-by: savvides <1580637+savvides@users.noreply.github.com>
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Code Review
This pull request updates the bin/idstack-learnings-search script to use standard tail -n syntax and adds -- to grep commands to prevent arguments from being interpreted as options. The feedback suggests refactoring the script to eliminate duplicated fallback logic by using a flag variable, which would improve maintainability.
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| " 2>/dev/null || { | ||
| # Fallback: basic grep | ||
| if [ -n "$KEYWORD" ]; then | ||
| cat $SOURCES 2>/dev/null | grep -i "$KEYWORD" | tail -"$LIMIT" | ||
| cat $SOURCES 2>/dev/null | grep -i -- "$KEYWORD" | tail -n "$LIMIT" | ||
| elif [ -n "$TYPE" ]; then | ||
| cat $SOURCES 2>/dev/null | grep "\"type\":\"$TYPE\"" | tail -"$LIMIT" | ||
| cat $SOURCES 2>/dev/null | grep -- "\"type\":\"$TYPE\"" | tail -n "$LIMIT" | ||
| else | ||
| cat $SOURCES 2>/dev/null | tail -"$LIMIT" | ||
| cat $SOURCES 2>/dev/null | tail -n "$LIMIT" | ||
| fi | ||
| } | ||
| else | ||
| if [ -n "$KEYWORD" ]; then | ||
| cat $SOURCES 2>/dev/null | grep -i "$KEYWORD" | tail -"$LIMIT" | ||
| cat $SOURCES 2>/dev/null | grep -i -- "$KEYWORD" | tail -n "$LIMIT" | ||
| elif [ -n "$TYPE" ]; then | ||
| cat $SOURCES 2>/dev/null | grep "\"type\":\"$TYPE\"" | tail -"$LIMIT" | ||
| cat $SOURCES 2>/dev/null | grep -- "\"type\":\"$TYPE\"" | tail -n "$LIMIT" | ||
| else | ||
| cat $SOURCES 2>/dev/null | tail -"$LIMIT" | ||
| cat $SOURCES 2>/dev/null | tail -n "$LIMIT" | ||
| fi | ||
| fi |
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The fallback basic grep logic is duplicated across the Python execution failure block (lines 74-80) and the else block when Python is not available (lines 83-89). This duplication makes the script harder to maintain and prone to errors if the fallback logic needs to be updated in the future (as seen in this PR where changes had to be applied in both places).
We can eliminate this duplication by setting a flag RUN_FALLBACK=1 and executing the fallback logic once after the if-else block.
" 2>/dev/null || RUN_FALLBACK=1
else
RUN_FALLBACK=1
fi
if [ "$RUN_FALLBACK" = "1" ]; then
if [ -n "$KEYWORD" ]; then
cat $SOURCES 2>/dev/null | grep -i -- "$KEYWORD" | tail -n "$LIMIT"
elif [ -n "$TYPE" ]; then
cat $SOURCES 2>/dev/null | grep -- "\"type\":\"$TYPE\"" | tail -n "$LIMIT"
else
cat $SOURCES 2>/dev/null | tail -n "$LIMIT"
fi
fi
1 participant
🎯 What: The vulnerability fixed
In
bin/idstack-learnings-search,grepcommands were executing with user-supplied search variables ($KEYWORD,$TYPE) without the end-of-options indicator (--).Variables starting with a hyphen (
-) are interpreted bygrepas command-line options instead of search patterns. This can lead to unexpected errors, option injection vulnerabilities, or denial of service when users input certain search terms (like-e).🛡️ Solution: How the fix addresses the vulnerability
Added the
--indicator before the variables in thegrepcommands. This ensures that any subsequent string, even if it starts with a hyphen, is treated as a pattern or file name, not an option. Also updated deprecatedtail -"$LIMIT"to the standardtail -n "$LIMIT".PR created automatically by Jules for task 10522436323216790778 started by @savvides