发布日期：2015-04-01
更新日期：2015-04-01

受影响系统：

Apache Group Subversion 1.8.0-1.8.11
Apache Group Subversion 1.6.0-1.7.19

描述：

---

CVE(CAN) ID: CVE-2015-0248

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 mod_dav_svn及svnserve服务器处理待评估的某些具特殊参数的请求时，会触发断言。断言会造成svnserve进程或进程代管mod_dav_svn模块(Apache)异常中止。这可导致拒绝服务。

<*来源：Evgeny Kotkov
  
  链接：http://subversion.apache.org/security/CVE-2015-0248-advisory.txt
*>

建议：

---

厂商补丁：

Apache Group
------------
Apache Group已经为此发布了一个安全公告（CVE-2015-0248-advisory）以及相应补丁:
CVE-2015-0248-advisory：Subversion mod_dav_svn and svnserve are vulnerable to a remotely triggerable   assertion DoS vulnerability for certain requests with dynamically evaluated   revision numbers.
链接：http://subversion.apache.org/security/CVE-2015-0248-advisory.txt

补丁:
1.7.19的补丁：
[[[
Index: subversion/mod_dav_svn/reports/get-location-segments.c
===================================================================
--- subversion/mod_dav_svn/reports/get-location-segments.c    (revision 1658197)
+++ subversion/mod_dav_svn/reports/get-location-segments.c    (working copy)
@@ -181,17 +181,36 @@ dav_svn__get_location_segments_report(const dav_re
                                   "Not all parameters passed.",
                                   SVN_DAV_ERROR_NAMESPACE,
                                   SVN_DAV_ERROR_TAG);
-  if (SVN_IS_VALID_REVNUM(start_rev)
-      && SVN_IS_VALID_REVNUM(end_rev)
-      && (end_rev > start_rev))
+
+  /* No START_REV or PEG_REVISION?  We'll use HEAD. */
+  if (!SVN_IS_VALID_REVNUM(start_rev) || !SVN_IS_VALID_REVNUM(peg_revision))
+    {
+      svn_revnum_t youngest;
+
+      serr = svn_fs_youngest_rev(&youngest, resource->info->repos->fs,
+                                 resource->pool);
+      if (serr != NULL)
+        return dav_svn__convert_err(serr, HTTP_INTERNAL_SERVER_ERROR,
+                                    "Could not determine youngest revision",
+                                    resource->pool);
+
+      if (!SVN_IS_VALID_REVNUM(start_rev))
+        start_rev = youngest;
+      if (!SVN_IS_VALID_REVNUM(peg_revision))
+        peg_revision = youngest;
+    }
+
+  /* No END_REV?  We'll use 0. */
+  if (!SVN_IS_VALID_REVNUM(end_rev))
+    end_rev = 0;
+
+  if (end_rev > start_rev)
     return dav_svn__new_error_tag(resource->pool, HTTP_BAD_REQUEST, 0,
                                   "End revision must not be younger than "
                                   "start revision",
                                   SVN_DAV_ERROR_NAMESPACE,
                                   SVN_DAV_ERROR_TAG);
-  if (SVN_IS_VALID_REVNUM(peg_revision)
-      && SVN_IS_VALID_REVNUM(start_rev)
-      && (start_rev > peg_revision))
+  if (start_rev > peg_revision)
     return dav_svn__new_error_tag(resource->pool, HTTP_BAD_REQUEST, 0,
                                   "Start revision must not be younger than "
                                   "peg revision",
Index: subversion/svnserve/serve.c
===================================================================
--- subversion/svnserve/serve.c    (revision 1658197)
+++ subversion/svnserve/serve.c    (working copy)
@@ -2266,10 +2266,31 @@ static svn_error_t *get_location_segments(svn_ra_s

   abs_path = svn_fspath__join(b->fs_path->data, relative_path, pool);

-  if (SVN_IS_VALID_REVNUM(start_rev)
-      && SVN_IS_VALID_REVNUM(end_rev)
-      && (end_rev > start_rev))
+  SVN_ERR(trivial_auth_request(conn, pool, b));
+  SVN_ERR(log_command(baton, conn, pool, "%s",
+                      svn_log__get_location_segments(abs_path, peg_revision,
+                                                     start_rev, end_rev,
+                                                     pool)));
+
+  /* No START_REV or PEG_REVISION?  We'll use HEAD. */
+  if (!SVN_IS_VALID_REVNUM(start_rev) || !SVN_IS_VALID_REVNUM(peg_revision))
     {
+      svn_revnum_t youngest;
+
+      SVN_CMD_ERR(svn_fs_youngest_rev(&youngest, b->fs, pool));
+
+      if (!SVN_IS_VALID_REVNUM(start_rev))
+        start_rev = youngest;
+      if (!SVN_IS_VALID_REVNUM(peg_revision))
+        peg_revision = youngest;
+    }
+
+  /* No END_REV?  We'll use 0. */
+  if (!SVN_IS_VALID_REVNUM(end_rev))
+    end_rev = 0;
+
+  if (end_rev > start_rev)
+    {
       err = svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL,
                               "Get-location-segments end revision must not be "
                               "younger than start revision");
@@ -2276,9 +2297,7 @@ static svn_error_t *get_location_segments(svn_ra_s
       return log_fail_and_flush(err, b, conn, pool);
     }

-  if (SVN_IS_VALID_REVNUM(peg_revision)
-      && SVN_IS_VALID_REVNUM(start_rev)
-      && (start_rev > peg_revision))
+  if (start_rev > peg_revision)
     {
       err = svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL,
                               "Get-location-segments start revision must not "
@@ -2286,12 +2305,6 @@ static svn_error_t *get_location_segments(svn_ra_s
       return log_fail_and_flush(err, b, conn, pool);
     }

-  SVN_ERR(trivial_auth_request(conn, pool, b));
-  SVN_ERR(log_command(baton, conn, pool, "%s",
-                      svn_log__get_location_segments(abs_path, peg_revision,
-                                                     start_rev, end_rev,
-                                                     pool)));
-
   /* All the parameters are fine - let's perform the query against the
    * repository. */

]]]

1.8.11的补丁:
[[[
Index: subversion/mod_dav_svn/reports/get-location-segments.c
===================================================================
--- subversion/mod_dav_svn/reports/get-location-segments.c    (revision 1658197)
+++ subversion/mod_dav_svn/reports/get-location-segments.c    (working copy)
@@ -181,17 +181,36 @@ dav_svn__get_location_segments_report(const dav_re
                                   "Not all parameters passed.",
                                   SVN_DAV_ERROR_NAMESPACE,
                                   SVN_DAV_ERROR_TAG);
-  if (SVN_IS_VALID_REVNUM(start_rev)
-      && SVN_IS_VALID_REVNUM(end_rev)
-      && (end_rev > start_rev))
+
+  /* No START_REV or PEG_REVISION?  We'll use HEAD. */
+  if (!SVN_IS_VALID_REVNUM(start_rev) || !SVN_IS_VALID_REVNUM(peg_revision))
+    {
+      svn_revnum_t youngest;
+
+      serr = svn_fs_youngest_rev(&youngest, resource->info->repos->fs,
+                                 resource->pool);
+      if (serr != NULL)
+        return dav_svn__convert_err(serr, HTTP_INTERNAL_SERVER_ERROR,
+                                    "Could not determine youngest revision",
+                                    resource->pool);
+
+      if (!SVN_IS_VALID_REVNUM(start_rev))
+        start_rev = youngest;
+      if (!SVN_IS_VALID_REVNUM(peg_revision))
+        peg_revision = youngest;
+    }
+
+  /* No END_REV?  We'll use 0. */
+  if (!SVN_IS_VALID_REVNUM(end_rev))
+    end_rev = 0;
+
+  if (end_rev > start_rev)
     return dav_svn__new_error_tag(resource->pool, HTTP_BAD_REQUEST, 0,
                                   "End revision must not be younger than "
                                   "start revision",
                                   SVN_DAV_ERROR_NAMESPACE,
                                   SVN_DAV_ERROR_TAG);
-  if (SVN_IS_VALID_REVNUM(peg_revision)
-      && SVN_IS_VALID_REVNUM(start_rev)
-      && (start_rev > peg_revision))
+  if (start_rev > peg_revision)
     return dav_svn__new_error_tag(resource->pool, HTTP_BAD_REQUEST, 0,
                                   "Start revision must not be younger than "
                                   "peg revision",
Index: subversion/svnserve/serve.c
===================================================================
--- subversion/svnserve/serve.c    (revision 1658197)
+++ subversion/svnserve/serve.c    (working copy)
@@ -2468,10 +2468,31 @@ static svn_error_t *get_location_segments(svn_ra_s

   abs_path = svn_fspath__join(b->fs_path->data, relative_path, pool);

-  if (SVN_IS_VALID_REVNUM(start_rev)
-      && SVN_IS_VALID_REVNUM(end_rev)
-      && (end_rev > start_rev))
+  SVN_ERR(trivial_auth_request(conn, pool, b));
+  SVN_ERR(log_command(baton, conn, pool, "%s",
+                      svn_log__get_location_segments(abs_path, peg_revision,
+                                                     start_rev, end_rev,
+                                                     pool)));
+
+  /* No START_REV or PEG_REVISION?  We'll use HEAD. */
+  if (!SVN_IS_VALID_REVNUM(start_rev) || !SVN_IS_VALID_REVNUM(peg_revision))
     {
+      svn_revnum_t youngest;
+
+      SVN_CMD_ERR(svn_fs_youngest_rev(&youngest, b->fs, pool));
+
+      if (!SVN_IS_VALID_REVNUM(start_rev))
+        start_rev = youngest;
+      if (!SVN_IS_VALID_REVNUM(peg_revision))
+        peg_revision = youngest;
+    }
+
+  /* No END_REV?  We'll use 0. */
+  if (!SVN_IS_VALID_REVNUM(end_rev))
+    end_rev = 0;
+
+  if (end_rev > start_rev)
+    {
       err = svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL,
                               "Get-location-segments end revision must not be "
                               "younger than start revision");
@@ -2478,9 +2499,7 @@ static svn_error_t *get_location_segments(svn_ra_s
       return log_fail_and_flush(err, b, conn, pool);
     }

-  if (SVN_IS_VALID_REVNUM(peg_revision)
-      && SVN_IS_VALID_REVNUM(start_rev)
-      && (start_rev > peg_revision))
+  if (start_rev > peg_revision)
     {
       err = svn_error_createf(SVN_ERR_INCORRECT_PARAMS, NULL,
                               "Get-location-segments start revision must not "
@@ -2488,12 +2507,6 @@ static svn_error_t *get_location_segments(svn_ra_s
       return log_fail_and_flush(err, b, conn, pool);
     }

-  SVN_ERR(trivial_auth_request(conn, pool, b));
-  SVN_ERR(log_command(baton, conn, pool, "%s",
-                      svn_log__get_location_segments(abs_path, peg_revision,
-                                                     start_rev, end_rev,
-                                                     pool)));
-
   /* All the parameters are fine - let's perform the query against the
    * repository. */

]]]

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