Josh Knapp
753743de20
25h whp01 burn-in (2026-05-13) found ~11% FP rate on rule 913100: ActivityPub federation pulls (Mastodon UA "...Bot" on hackerpublicradio.org and blog.anti-social.online) and SiteLockSpider scans (a customer-paid security service hitting greggfranklin.com + suchascream.net). The other six promoted rule families (930120, 932100-160, 933170-200, 944100-300, 920440, 930130) showed zero FPs across the same window and stay enforced. Detection-only still feeds the anomaly score, so we lose ~no real blocking value by demoting this family.
97 lines
5.5 KiB
Plaintext
97 lines
5.5 KiB
Plaintext
# WHP day-one enforce overrides for coraza-spoa.
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#
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# Global mode in config.yaml is SecRuleEngine DetectionOnly. The rule ID
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# ranges below are promoted to enforcement individually, chosen for very
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# low false-positive rate on the kinds of customer traffic seen on WHP
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# (WordPress, WooCommerce, Divi page builders).
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#
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# When bumping the upstream coraza-spoa pin (and thus the bundled CRS):
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# 1. Skim the CRS CHANGELOG for new/changed rules in these ID ranges.
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# 2. Verify they're still high-confidence before promoting the new image.
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# 3. Smoke-test in staging detect-only mode for 24h before flipping enforce.
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#
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# Per-customer false-positive tuning lives in a future per-customer
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# override mechanism; v1 is server-wide.
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# ---------------------------------------------------------------------------
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# 930120 — LFI: explicit traversal to sensitive system files
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# (/etc/passwd, /proc/self/, /.ssh/, /etc/shadow, /etc/group, etc.)
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# Unambiguous probe pattern; no legitimate site path leads here.
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# Note: 930xxx as a whole includes broader traversal patterns that can FP
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# on legitimate relative-path file browsers — keep those detect-only.
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# ---------------------------------------------------------------------------
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SecRuleUpdateActionById 930120 "ctl:ruleEngine=On"
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# ---------------------------------------------------------------------------
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# 932100-932160 — RCE: Unix shell command injection
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# Patterns like `; cat /etc/passwd`, `|whoami`, backtick `\`uname\``,
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# $(...) substitution, &&/|| chaining with shell builtins.
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# Don't appear in normal POST bodies, URL params, or headers. Targeting
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# these is unambiguous attempted command execution.
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# ---------------------------------------------------------------------------
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SecRuleUpdateActionById 932100-932160 "ctl:ruleEngine=On"
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# ---------------------------------------------------------------------------
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# 933170-933200 — PHP Webshell access patterns
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# Direct requests to known webshell paths: c99.php, r57.php, b374k.php,
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# wso.php, alfa.php, mini.php, etc. Almost universally reconnaissance
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# scanning for post-exploitation. Even legitimate WordPress installs
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# never serve these paths.
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# ---------------------------------------------------------------------------
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SecRuleUpdateActionById 933170-933200 "ctl:ruleEngine=On"
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# ---------------------------------------------------------------------------
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# 944100-944300 — Log4Shell / JNDI injection
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# `${jndi:ldap://}`, `${jndi:rmi://}`, and obfuscated variants thereof
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# in headers, query strings, or bodies. Even our PHP/Node stack isn't
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# vulnerable, but blocking at the edge keeps logs clean and protects
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# any future Java workloads.
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# ---------------------------------------------------------------------------
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SecRuleUpdateActionById 944100-944300 "ctl:ruleEngine=On"
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# ---------------------------------------------------------------------------
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# 920440 — URL file extension restricted by policy
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# Catches probes for backup / config / dump files: .bak, .old, .save,
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# .swp, .sql, .dist, .backup. Promoted to enforce after empirical
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# observation on whp01 (2026-05-12, first ~30 min of detect-only):
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# 124 events, all backup-file recon — `/wp-config.php.old`,
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# `/db_backup.sql`, `/.env.save`, `/releases.sql`, etc. — from a
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# single GCP-hosted scanner. Zero false positives observed; standard
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# WP/WooCommerce/Divi/HPR URLs do not end in these extensions.
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# ---------------------------------------------------------------------------
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SecRuleUpdateActionById 920440 "ctl:ruleEngine=On"
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# ---------------------------------------------------------------------------
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# 930130 — Restricted File Access Attempt
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# Catches dotfile / VCS / config-disclosure probes: .env (and .env.local /
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# .env.bak / .env.save variants), .git/config, config.php at root or under
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# /admin /backend, etc. Distinct from 930120 (system file paths like
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# /etc/passwd); this targets application secret files.
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#
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# Promoted to enforce on the same observation pass that justified 920440:
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# 117 events split across joshuaknapp.net (136), cgdannyb.com (51),
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# onlinesupplements.net (23) — all `.env`-class disclosure probes.
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# Zero false positives observed. Notably, HPR's `/ccdn.php?filename=...`
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# audio delivery path does NOT trigger this rule — verified empirically.
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# ---------------------------------------------------------------------------
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SecRuleUpdateActionById 930130 "ctl:ruleEngine=On"
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# ---------------------------------------------------------------------------
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# Rule families intentionally kept at DETECT-ONLY for v1 — high FP rate
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# on customer mix. Promote individually after observation:
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#
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# 913xxx (Scanner UAs)— matches legitimate ActivityPub federation
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# (Mastodon's "...Bot" UA) and SiteLockSpider (a
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# paid customer-security service some sites use).
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# Observed on whp01 burn-in 2026-05-13:
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# 20/185 hits = ~11% FP rate on HPR + greggfranklin
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# + suchascream. Detection adds anomaly score
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# either way; enforce upside is low.
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# 941xxx (XSS) — Divi rich-text editor saves, TinyMCE submissions
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# 942xxx (SQLi) — WP admin queries reflected in params
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# 920xxx (other) — most 920xxx rules; 920440 specifically promoted above
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# 933150 — PHP injection FP on WooCommerce checkout
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# (`session_start` literal appearing in billing form data)
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# 950xxx-953xxx — Data leakage / backup-file disclosure (mixed FP)
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# ---------------------------------------------------------------------------
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