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              "value": "\u003cp\u003e\u003cspan\u003eLDAPCache\u003c/span\u003e\u0026nbsp;and\u0026nbsp;\u003ccode\u003eLDAPBackingEngine\u003c/code\u003e\u0026nbsp;build LDAP search filters for user lookup and role lookup by textually substituting the placeholders\u0026nbsp;\u003ccode\u003e%u\u003c/code\u003e,\u0026nbsp;\u003ccode\u003e%dn\u003c/code\u003e, and\u0026nbsp;\u003ccode\u003e%fqdn\u003c/code\u003e\u0026nbsp;(drawn from the login name, the resolved user DN, and its fully qualified namespace form) into administrator-configured filter templates (\u003ccode\u003euserFilter\u003c/code\u003e,\u0026nbsp;\u003ccode\u003eroleFilter\u003c/code\u003e). Before the fix, the only sanitization applied to the substituted value was double backslashed:\u003c/p\u003e\u003cdiv\u003e\u003ccode\u003efilter = filter.replaceAll(Pattern.quote(\"%u\"), Matcher.quoteReplacement(user));\u003c/code\u003e\u003c/div\u003e\u003cdiv\u003e\u003ccode\u003efilter = filter.replace(\"\\\\\", \"\\\\\\\\\");\u003c/code\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eThis does not escape the other characters RFC 4515 requires escaping in an LDAP search filter:\u0026nbsp;\u003ccode\u003e*\u003c/code\u003e,\u0026nbsp;\u003ccode\u003e(\u003c/code\u003e,\u0026nbsp;\u003ccode\u003e)\u003c/code\u003e, and\u0026nbsp;\u003ccode\u003eNUL\u003c/code\u003e. A login name containing any of these can change the structure of the resulting filter rather than being matched as a literal value (e.g. a crafted username can turn an equality match into a wildcard match, or close/reopen filter clauses), widening what the search returns and potentially causing a login or role lookup to match an LDAP entry other than the intended one, over-granting roles, and depending on deployment-specific filter templates, potentially affecting which account a login resolved to.\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eIt\u0027s not exploitable through every entry points:\u0026nbsp;\u003ccode\u003eLDAPLoginModule\u003c/code\u003e\u0026nbsp;and\u0026nbsp;\u003ccode\u003eLDAPPubkeyLoginModule\u003c/code\u003e\u0026nbsp;both called\u0026nbsp;\u003ccode\u003eUtil.doRFC2254Encoding()\u003c/code\u003e\u0026nbsp;(correct RFC 4515 escaping) on the login name before handing it to\u0026nbsp;\u003ccode\u003eLDAPCache\u003c/code\u003e, which masked the missing escaping in\u0026nbsp;\u003ccode\u003eLDAPCache\u003c/code\u003e\u0026nbsp;for those two call paths. Using\u0026nbsp;\u003ccode\u003eLDAPCache\u003c/code\u003e\u0026nbsp;directly (bypassing the login modules) does not reproduce through the normal\u0026nbsp;\u003ccode\u003eLDAPLoginModule\u003c/code\u003e/\u003ccode\u003eLDAPPubkeyLoginModule\u003c/code\u003e\u0026nbsp;authentication flow for this reason. It does reproduce through two other call paths that reach\u0026nbsp;\u003ccode\u003eLDAPCache\u003c/code\u003e/\u003ccode\u003eLDAPBackingEngine\u003c/code\u003e\u0026nbsp;without any prior escaping:\u003c/div\u003e\u003cdiv\u003e\u003cul\u003e\u003cli\u003e\u003ccode\u003eGSSAPILdapLoginModule\u003c/code\u003e\u0026nbsp;passes the\u0026nbsp;\u003ccode\u003eNameCallback\u003c/code\u003e\u0026nbsp;name straight through, unescaped.\u003c/li\u003e\u003cli\u003e\u003ccode\u003eLDAPBackingEngine\u003c/code\u003e\u0026nbsp;(\u003ccode\u003elistRoles\u003c/code\u003e) passes\u0026nbsp;\u003ccode\u003eprincipal.getName()\u003c/code\u003e\u0026nbsp;straight through, unescaped.\u003c/li\u003e\u003c/ul\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003c/div\u003e"
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It does reproduce through two other call paths that reach\\u00a0LDAPCache/LDAPBackingEngine\\u00a0without any prior escaping:\\n\\n  *  GSSAPILdapLoginModule\\u00a0passes the\\u00a0NameCallback\\u00a0name straight through, unescaped.\\n  *  LDAPBackingEngine\\u00a0(listRoles) passes\\u00a0principal.getName()\\u00a0straight through, unescaped.\", \"lang\": \"en\", \"supportingMedia\": [{\"type\": \"text/html\", \"base64\": false, \"value\": \"\u003cp\u003e\u003cspan\u003eLDAPCache\u003c/span\u003e\u0026nbsp;and\u0026nbsp;\u003ccode\u003eLDAPBackingEngine\u003c/code\u003e\u0026nbsp;build LDAP search filters for user lookup and role lookup by textually substituting the placeholders\u0026nbsp;\u003ccode\u003e%u\u003c/code\u003e,\u0026nbsp;\u003ccode\u003e%dn\u003c/code\u003e, and\u0026nbsp;\u003ccode\u003e%fqdn\u003c/code\u003e\u0026nbsp;(drawn from the login name, the resolved user DN, and its fully qualified namespace form) into administrator-configured filter templates (\u003ccode\u003euserFilter\u003c/code\u003e,\u0026nbsp;\u003ccode\u003eroleFilter\u003c/code\u003e). 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