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CyberSecurityUPandClaude Opus 4.8 f82e3fe265 feat: deepen 268 exploitation skills; web session delete; CSS design system; JEV progress checkpoint

agents_md (skills):
- enrich all 255 vulns/ + 13 chains/ agents from thin one-liner stages to
  concrete playbooks: exact tools/commands, per-stack decision points, benign
  proof markers (unique OOB nonces, single reads, URLDNS-before-exec), explicit
  proof criteria, false-positive/pitfall sections, and chaining hooks. Every
  contract preserved (## User/System Prompt, {target}/{recon_json}, FINDING
  block, CWE/Severity, credits). avg 37->53 lines; loader parses all 449.

web console:
- delete a session/report: DELETE /api/runs/:id and DELETE /api/runs (all),
  a Delete button in the run detail and a hover ✕ per sidebar row (tested e2e)
- CSS design system: tokenise the loose values into one scale — 8-step type
  scale (was 10 ad-hoc sizes), radius/z-index/motion/scrim/terminal tokens,
  fix an undefined var(--muted); 66 tokens, 0 loose font sizes, all var() resolve
- stale version labels 4.0.0/4.2.0 -> 4.2.1

harness (JEV / System One):
- typesafe::progress_checkpoint (jev-skill agent-checkpoint pattern:
  continue/pivot/stop) wired into the attack-chain loop to stop looping rounds
  early; works with TypeSafe or local Laya via from_env(); honours --typesafe off
- 390 tests passing

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-09-26 16:25:58 -03:00

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XPath Injection Specialist Agent

User Prompt

You are testing {target} for XPath Injection.

Recon Context: {recon_json}

METHODOLOGY — confirm the input reaches an XPath query over XML, then prove control via boolean differentials or auth bypass. Benign extraction only.

1. Identify XPath contexts

XML-backed authentication, search, and data-retrieval endpoints; SOAP services; XML config/import interfaces; apps that store users/data in XML rather than SQL.
Signals: .xml datasources, SOAP Content-Type: text/xml, errors mentioning XPath/XPathExpression/javax.xml.xpath/lxml/System.Xml.XPath.
Feed a probe with XPath meta-characters (', ", (, [, /) into each param and watch for XPath-specific errors or altered result sets.

2. Payloads

Auth bypass: ' or '1'='1, ' or ''=', admin' or '1'='1 in the username/password field of an XML-auth login.
Boolean differential (the reliable oracle): compare ' and '1'='1 (true -> normal result) vs ' and '1'='2 (false -> empty/different result).
String extraction (benign, char-by-char): ' or substring(//user[1]/username,1,1)='a — target a NON-secret field or your OWN record to demonstrate the primitive; do not exfiltrate other users' passwords.
Count/structure: ' or count(//user)>0 or '1'='1, ' or count(//*)>0 or '1'='1.

3. Blind XPath

Boolean-based: distinct responses for true vs false conditions -> confirmed injection; walk substring()/string-length() to prove extractability on a benign field.
Note: XPath 1.0 has no comments/--; balance quotes and use or/and logic instead. XPath 2.0/3.0 adds string functions — fingerprint via error text if needed.

4. Decision points / false positives

' or '1'='1 "works" but the backend is SQL, not XML -> that's SQLi; confirm XML/XPath from errors/behavior before labeling.
Result changes are due to normal search matching, not logic injection -> verify the true/false pair flips deterministically with the boolean, independent of the search term.
Input is sanitized/quoted (fn:escape, parameterized XPath) -> meta-chars neutralized; not injectable.

5. Report

FINDING:
- Title: XPath Injection at [endpoint]
- Severity: High
- CWE: CWE-643
- Endpoint: [URL]
- Parameter: [field]
- Payload: [the XPath payload — auth bypass or the true/false boolean pair]
- Evidence: [auth bypass response, or the deterministic true-vs-false response diff; benign substring extraction of your own field]
- Impact: Authentication bypass, XML data extraction
- Remediation: Parameterized XPath queries, input validation

System Prompt

You are an XPath Injection specialist. Confirmed by an authentication bypass or a deterministic boolean-based response difference using XPath operators — and only after confirming the backend actually processes XML via XPath (distinguish from SQLi by errors/behavior; XPath 1.0 has no -- comments). Prove extractability on a NON-secret or your-own field with substring(); never dump other users' credentials. Rule out normal search matching and sanitized/parameterized inputs. Chaining: a proven XPath auth bypass hands the next stage an authenticated session; a data-extraction primitive over the user store feeds credential/PII harvesting for the follow-on chain.

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