🛡️ Sentinel: [MEDIUM] Secure backup file permissions and fix argument injection#33
🛡️ Sentinel: [MEDIUM] Secure backup file permissions and fix argument injection#33
Conversation
… injection - Enforce 0700 permissions on backup and log directories. - use umask 077 for zip creation (0600 permissions). - Use bash arrays for zip exclude arguments to fix space handling. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughThis pull request introduces security hardening to a backup script and documents the vulnerabilities being addressed. Changes include removing a shell function, inlining exclude patterns, setting explicit directory permissions to 0700, applying umask 077 before archive creation, and using quoted array expansion to prevent argument injection. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Poem
🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/sentinel.md:
- Around line 1-4: Change the heading "2026-02-17 - Insecure Temporary Files &
Shell Argument Injection" from level 2 to a top-level heading (use `#`), add a
blank line immediately after that heading, insert a blank line before the
numbered list so the list is separated from surrounding text, and wrap or break
the long sentences on the list items (lines referencing the backup script and
zip exclude patterns) so no line exceeds 80 characters to satisfy MD041, MD022,
MD032 and MD013; ensure the final markdown preserves the same wording but with
line breaks and blank lines added.
In `@tools/backup-projects.sh`:
- Around line 344-353: Ensure secure directory permissions for BACKUP_TEMP_DIR
and LOG_DIR regardless of prior existence: replace the current conditional
mkdir+chmod logic by (a) creating dirs with secure mode atomically using install
-d -m 700 (or run mkdir -p inside a subshell after setting umask 077) to avoid
parent dirs inheriting umask, and (b) unconditionally run chmod 700 on
BACKUP_TEMP_DIR and LOG_DIR after creation to eliminate any
TOCTOU/inherited-permission gaps; update the blocks that reference
BACKUP_TEMP_DIR and LOG_DIR to implement this change.
| ## 2026-02-17 - Insecure Temporary Files & Shell Argument Injection | ||
| **Vulnerability:** | ||
| 1. Backup script created directories and files in default umask (likely 755/644), exposing sensitive source code backups to other users. | ||
| 2. Shell script passed exclude patterns as a space-separated string to `zip`, causing incorrect argument parsing if patterns contained spaces (argument injection/logic error). |
There was a problem hiding this comment.
Fix markdown lint failures flagged by the pipeline.
The Lint Documentation check reports several failures on this file:
- Line 1:
MD041— First line should be a top-level heading (#, not##). - Line 1:
MD022— Heading needs a blank line below it. - Line 3:
MD032— Lists should be surrounded by blank lines (add a blank line before the numbered list). - Lines 3–4:
MD013— Lines exceed the 80-character limit.
Proposed fix
-## 2026-02-17 - Insecure Temporary Files & Shell Argument Injection
-**Vulnerability:**
-1. Backup script created directories and files in default umask (likely 755/644), exposing sensitive source code backups to other users.
-2. Shell script passed exclude patterns as a space-separated string to `zip`, causing incorrect argument parsing if patterns contained spaces (argument injection/logic error).
+# 2026-02-17 - Insecure Temporary Files & Shell Argument Injection
+
+**Vulnerability:**
+
+1. Backup script created directories and files in default umask
+ (likely 755/644), exposing sensitive source code backups to
+ other users.
+2. Shell script passed exclude patterns as a space-separated string
+ to `zip`, causing incorrect argument parsing if patterns contained
+ spaces (argument injection/logic error).📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| ## 2026-02-17 - Insecure Temporary Files & Shell Argument Injection | |
| **Vulnerability:** | |
| 1. Backup script created directories and files in default umask (likely 755/644), exposing sensitive source code backups to other users. | |
| 2. Shell script passed exclude patterns as a space-separated string to `zip`, causing incorrect argument parsing if patterns contained spaces (argument injection/logic error). | |
| # 2026-02-17 - Insecure Temporary Files & Shell Argument Injection | |
| **Vulnerability:** | |
| 1. Backup script created directories and files in default umask | |
| (likely 755/644), exposing sensitive source code backups to | |
| other users. | |
| 2. Shell script passed exclude patterns as a space-separated string | |
| to `zip`, causing incorrect argument parsing if patterns contained | |
| spaces (argument injection/logic error). |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 175] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 3-3: Lists should be surrounded by blank lines
.jules/sentinel.md:3 MD032/blanks-around-lists Lists should be surrounded by blank lines [Context: "1. Backup script created direc..."] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md032.md
[failure] 3-3: Line length
.jules/sentinel.md:3:81 MD013/line-length Line length [Expected: 80; Actual: 136] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 1-1: First line in a file should be a top-level heading
.jules/sentinel.md:1 MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## 2026-02-17 - Insecure Tempo..."] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md041.md
[failure] 1-1: Headings should be surrounded by blank lines
.jules/sentinel.md:1 MD022/blanks-around-headings Headings should be surrounded by blank lines [Expected: 1; Actual: 0; Below] [Context: "## 2026-02-17 - Insecure Temporary Files & Shell Argument Injection"] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md022.md
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.jules/sentinel.md around lines 1 - 4, Change the heading "2026-02-17 -
Insecure Temporary Files & Shell Argument Injection" from level 2 to a top-level
heading (use `#`), add a blank line immediately after that heading, insert a
blank line before the numbered list so the list is separated from surrounding
text, and wrap or break the long sentences on the list items (lines referencing
the backup script and zip exclude patterns) so no line exceeds 80 characters to
satisfy MD041, MD022, MD032 and MD013; ensure the final markdown preserves the
same wording but with line breaks and blank lines added.
| # Ensure directories exist with secure permissions (0700) | ||
| if [[ ! -d "$BACKUP_TEMP_DIR" ]]; then | ||
| mkdir -p "$BACKUP_TEMP_DIR" | ||
| chmod 700 "$BACKUP_TEMP_DIR" | ||
| fi | ||
|
|
||
| if [[ ! -d "$LOG_DIR" ]]; then | ||
| mkdir -p "$LOG_DIR" | ||
| chmod 700 "$LOG_DIR" | ||
| fi |
There was a problem hiding this comment.
Directory permissions are not enforced when the directory already exists, and mkdir -p creates parent dirs with default umask.
Two concerns:
- The
chmod 700is only applied when the directory is freshly created. If it already exists with lax permissions (e.g., from a previous run with the old code, or external tampering), the script silently proceeds with insecure permissions. mkdir -pcreates intermediate parent directories using the current umask (not 700). There's also a small TOCTOU window betweenmkdirandchmod.
Consider always enforcing permissions (unconditionally), and using install -d -m 700 as recommended in your own sentinel.md, or setting umask 077 before mkdir -p:
Proposed fix
- # Ensure directories exist with secure permissions (0700)
- if [[ ! -d "$BACKUP_TEMP_DIR" ]]; then
- mkdir -p "$BACKUP_TEMP_DIR"
- chmod 700 "$BACKUP_TEMP_DIR"
- fi
-
- if [[ ! -d "$LOG_DIR" ]]; then
- mkdir -p "$LOG_DIR"
- chmod 700 "$LOG_DIR"
- fi
+ # Ensure directories exist with secure permissions (0700)
+ (
+ umask 077
+ mkdir -p "$BACKUP_TEMP_DIR" "$LOG_DIR"
+ )
+ chmod 700 "$BACKUP_TEMP_DIR" "$LOG_DIR"The final chmod 700 unconditionally enforces correct permissions even if the directories pre-existed. The umask 077 in the subshell ensures any intermediate directories created by -p are also restrictive.
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| # Ensure directories exist with secure permissions (0700) | |
| if [[ ! -d "$BACKUP_TEMP_DIR" ]]; then | |
| mkdir -p "$BACKUP_TEMP_DIR" | |
| chmod 700 "$BACKUP_TEMP_DIR" | |
| fi | |
| if [[ ! -d "$LOG_DIR" ]]; then | |
| mkdir -p "$LOG_DIR" | |
| chmod 700 "$LOG_DIR" | |
| fi | |
| # Ensure directories exist with secure permissions (0700) | |
| ( | |
| umask 077 | |
| mkdir -p "$BACKUP_TEMP_DIR" "$LOG_DIR" | |
| ) | |
| chmod 700 "$BACKUP_TEMP_DIR" "$LOG_DIR" |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@tools/backup-projects.sh` around lines 344 - 353, Ensure secure directory
permissions for BACKUP_TEMP_DIR and LOG_DIR regardless of prior existence:
replace the current conditional mkdir+chmod logic by (a) creating dirs with
secure mode atomically using install -d -m 700 (or run mkdir -p inside a
subshell after setting umask 077) to avoid parent dirs inheriting umask, and (b)
unconditionally run chmod 700 on BACKUP_TEMP_DIR and LOG_DIR after creation to
eliminate any TOCTOU/inherited-permission gaps; update the blocks that reference
BACKUP_TEMP_DIR and LOG_DIR to implement this change.
1 participant
🛡️ Sentinel: [MEDIUM] Secure backup file permissions and fix argument injection
Severity: MEDIUM
Vulnerability:
backup-projects.shscript created backup directories and zip files with default umask permissions (likely 755/644). This allowed other users on the system to read sensitive source code backups.zipexclude arguments as a space-separated string, which would break if exclude patterns contained spaces (e.g., "test data").Fix:
0700permissions on the backup directory and0700on the log directory.umask 077in a subshell when runningzipto ensure the created archive file has0600permissions (read/write only by owner)."${exclude_args[@]}") for passing exclude patterns tozip, preventing argument splitting issues.Verification:
tools/backup-projects.sh --dry-runto verify logic../build.sh syntaxand./build.sh lintto verify script validity.700permissions.600permissions.PR created automatically by Jules for task 3026935310687047837 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation