发布日期：2013-07-22
更新日期：2013-07-25

受影响系统：

Subversion Subversion HTTPD servers 1.8.0
Subversion Subversion HTTPD servers 1.7.0 - 1.7.10

描述：

---

BUGTRAQ  ID: 61454
CVE(CAN) ID: CVE-2013-4131

Subversion是一款开源多用户版本控制系统，支持非ASCII文本和二进制数据。

Subversion的mod_dav_svn Apache HTTPD服务器模块对源代码根目录执行某些请求时（例如DELETE HTTP、MOVE HTTP、COPY HTTP）会触发断言，造成拒绝服务。如果断言被禁用，则会触发读溢出，造成段错误或其他不明影响。

<*来源：Daniel Shahaf
  
  链接：http://subversion.apache.org/security/CVE-2013-4131-advisory.txt
*>

建议：

---

临时解决方法：

Patches:
========

Patch for Subversion 1.7.x and 1.8.0:
[[[
Index: subversion/mod_dav_svn/repos.c
===================================================================
--- subversion/mod_dav_svn/repos.c    (revision 1503527)
+++ subversion/mod_dav_svn/repos.c    (revision 1503528)
@@ -2408,21 +2408,12 @@
                 svn_boolean_t is_urlpath,
                 apr_pool_t *pool)
{
-  apr_size_t len;
-  char *tmp = apr_pstrdup(pool, path);
-
-  len = strlen(tmp);
-
-  if (len > 0)
+  if (*path != '\0') /* not an empty string */
     {
-      /* Remove any trailing slash; else svn_path_dirname() asserts. */
-      if (tmp[len-1] == '/')
-        tmp[len-1] = '\0';
-
       if (is_urlpath)
-        return svn_urlpath__dirname(tmp, pool);
+        return svn_urlpath__dirname(path, pool);
       else
-        return svn_fspath__dirname(tmp, pool);
+        return svn_fspath__dirname(path, pool);
     }

   return path;
@@ -2458,7 +2449,9 @@
       parent->versioned = 1;
       parent->hooks = resource->hooks;
       parent->pool = resource->pool;
-      parent->uri = get_parent_path(resource->uri, TRUE, resource->pool);
+      parent->uri = get_parent_path(svn_urlpath__canonicalize(resource->uri,
+                                                              resource->pool),
+                                    TRUE, resource->pool);
       parent->info = parentinfo;

       parentinfo->uri_path =
]]]

厂商补丁：

Subversion
----------
Subversion已经为此发布了一个安全公告（CVE-2013-4131-advisory）以及相应补丁:
CVE-2013-4131-advisory：CVE-2013-4131-advisory
链接：http://subversion.apache.org/security/CVE-2013-4131-advisory.txt

补丁下载：http://subversion.apache.org/packages.html

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