- A+
@盛大网络
elasticsearch又出新版本了，这次修复了一个任意文件读取漏洞（写的是目录遍历）。
官方的release notes
在这里看描述:https://github.com/elastic/elasticsearch/pull/10815
在这里看漏洞详情：https://github.com/spinscale/elasticsearch/commit/5d8e9e24c917b5f2c0958ba68be34a42efaeadbc
原来代码是：if (!Files.exists(file) || Files.isHidden(file)) {修改后加了验证if (!Files.exists(file) || Files.isHidden(file) || !file.toAbsolutePath().normalize().startsWith(siteFile.toAbsolutePath())) {
/**
+ * Test normalizing of path
+ */
+ @Test
+ public void testThatPathsAreNormalized() throws Exception {
+ // more info: https://www.owasp.org/index.php/Path_Traversal
+ List<String> notFoundUris = new ArrayList<>();
+ notFoundUris.add("/_plugin/dummy/../../../../../log4j.properties");
+ notFoundUris.add("/_plugin/dummy/../../../../../%00log4j.properties");
+ notFoundUris.add("/_plugin/dummy/..%c0%af..%c0%af..%c0%af..%c0%af..%c0%aflog4j.properties");
+ notFoundUris.add("/_plugin/dummy/%2E%2E/%2E%2E/%2E%2E/%2E%2E/index.html");
+ notFoundUris.add("/_plugin/dummy/%2e%2e/%2e%2e/%2e%2e/%2e%2e/index.html");
+ notFoundUris.add("/_plugin/dummy/%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2findex.html");
+ notFoundUris.add("/_plugin/dummy/%2E%2E/%2E%2E/%2E%2E/%2E%2E/index.html");
+ notFoundUris.add("/_plugin/dummy/..\\..\\..\\..\\..\\log4j.properties");
+
+ for (String uri : notFoundUris) {
+ HttpResponse response = httpClient().path(uri).execute();
+ String message = String.format(Locale.ROOT, "URI [%s] expected to be not found", uri);
+ assertThat(message, response.getStatusCode(), equalTo(RestStatus.NOT_FOUND.getStatus()));
+ }
+
+ // using relative path inside of the plugin should work
+ HttpResponse response = httpClient().path("/_plugin/dummy/dir1/../dir1/../index.html").execute();
+ assertThat(response.getStatusCode(), equalTo(RestStatus.OK.getStatus()));
+ assertThat(response.getBody(), containsString("<title>Dummy Site Plugin</title>"));
+ }
最后会这样被调用：
try {
byte[] data = Files.readAllBytes(file);
channel.sendResponse(new BytesRestResponse(OK, guessMimeType(sitePath), data));
} catch (IOException e) {
channel.sendResponse(new BytesRestResponse(INTERNAL_SERVER_ERROR));
}
JDK7的Files把一个文件的内容读取后返回给客户端.
利用代码：curl http:// @wolf /_plugin/head/xxxxxx,注意curl版本.@wolf
