xrdp: CVE-2017-16927

Fix of CVE-2017-16927

Signed-off-by: Zheng Ruoqin <zhengrq.fnst@cn.fujitsu.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

2 files changed, 149 insertions, 0 deletions

diff --git a/meta-oe/recipes-support/xrdp/xrdp/0001-Fix-of-CVE-2017-16927.patch b/meta-oe/recipes-support/xrdp/xrdp/0001-Fix-of-CVE-2017-16927.patch
new file mode 100644
index 0000000000..4c93647f67
--- /dev/null
+++ b/meta-oe/recipes-support/xrdp/xrdp/0001-Fix-of-CVE-2017-16927.patch
@@ -0,0 +1,148 @@
+Subject: [PATCH] Fix CVE-2017-16927
+
+sesman: scpv0, accept variable length data fields
+
+Upstream-Status: Backport 
+
+---
+ sesman/libscp/libscp_v0.c | 32 +++++++++++++++++++++++++-------
+ 1 file changed, 25 insertions(+), 7 deletions(-)
+
+diff --git a/sesman/libscp/libscp_v0.c b/sesman/libscp/libscp_v0.c
+index 5a0c8bf..5693407 100644
+--- a/sesman/libscp/libscp_v0.c
++++ b/sesman/libscp/libscp_v0.c
+@@ -161,7 +161,7 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+     struct SCP_SESSION *session = 0;
+     tui16 sz;
+     tui32 code = 0;
+-    char buf[257];
++    char *buf = 0;
+ 
+     if (!skipVchk)
+     {
+@@ -226,27 +226,31 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+ 
+         /* reading username */
+         in_uint16_be(c->in_s, sz);
+-        buf[sz] = '\0';
++        buf = g_new0(char, sz);
+         in_uint8a(c->in_s, buf, sz);
+-
++        buf[sz] = '\0';
+         if (0 != scp_session_set_username(session, buf))
+         {
+             scp_session_destroy(session);
+             log_message(LOG_LEVEL_WARNING, "[v0:%d] connection aborted: error setting username", __LINE__);
++            g_free(buf);
+             return SCP_SERVER_STATE_INTERNAL_ERR;
+         }
++        g_free(buf);
+ 
+         /* reading password */
+         in_uint16_be(c->in_s, sz);
+-        buf[sz] = '\0';
++        buf = g_new0(char, sz);
+         in_uint8a(c->in_s, buf, sz);
+-
++        buf[sz] = '\0';
+         if (0 != scp_session_set_password(session, buf))
+         {
+             scp_session_destroy(session);
+             log_message(LOG_LEVEL_WARNING, "[v0:%d] connection aborted: error setting password", __LINE__);
++            g_free(buf);
+             return SCP_SERVER_STATE_INTERNAL_ERR;
+         }
++        g_free(buf);
+ 
+         /* width */
+         in_uint16_be(c->in_s, sz);
+@@ -272,9 +276,11 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+ 
+             if (sz > 0)
+             {
++                buf = g_new0(char, sz);
+                 in_uint8a(c->in_s, buf, sz);
+                 buf[sz] = '\0';
+                 scp_session_set_domain(session, buf);
++                g_free(buf);
+             }
+         }
+ 
+@@ -285,9 +291,11 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+ 
+             if (sz > 0)
+             {
++                buf = g_new0(char, sz);
+                 in_uint8a(c->in_s, buf, sz);
+                 buf[sz] = '\0';
+                 scp_session_set_program(session, buf);
++                g_free(buf);
+             }
+         }
+ 
+@@ -298,9 +306,11 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+ 
+             if (sz > 0)
+             {
++                buf = g_new0(char, sz);
+                 in_uint8a(c->in_s, buf, sz);
+                 buf[sz] = '\0';
+                 scp_session_set_directory(session, buf);
++                g_free(buf);
+             }
+         }
+ 
+@@ -311,9 +321,11 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+ 
+             if (sz > 0)
+             {
++                buf = g_new0(char, sz);
+                 in_uint8a(c->in_s, buf, sz);
+                 buf[sz] = '\0';
+                 scp_session_set_client_ip(session, buf);
++                g_free(buf);
+             }
+         }
+     }
+@@ -332,29 +344,35 @@ scp_v0s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
+         scp_session_set_type(session, SCP_GW_AUTHENTICATION);
+         /* reading username */
+         in_uint16_be(c->in_s, sz);
+-        buf[sz] = '\0';
++        buf = g_new0(char, sz);
+         in_uint8a(c->in_s, buf, sz);
++        buf[sz] = '\0';
+ 
+         /* g_writeln("Received user name: %s",buf); */
+         if (0 != scp_session_set_username(session, buf))
+         {
+             scp_session_destroy(session);
+             /* until syslog merge log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: error setting        username", __LINE__);*/
++            g_free(buf);
+             return SCP_SERVER_STATE_INTERNAL_ERR;
+         }
++        g_free(buf);
+ 
+         /* reading password */
+         in_uint16_be(c->in_s, sz);
+-        buf[sz] = '\0';
++        buf = g_new0(char, sz);
+         in_uint8a(c->in_s, buf, sz);
++        buf[sz] = '\0';
+ 
+         /* g_writeln("Received password: %s",buf); */
+         if (0 != scp_session_set_password(session, buf))
+         {
+             scp_session_destroy(session);
+             /* until syslog merge log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: error setting password", __LINE__); */
++            g_free(buf);
+             return SCP_SERVER_STATE_INTERNAL_ERR;
+         }
++        g_free(buf);
+     }
+     else
+     {
+-- 
+2.7.4
+
diff --git a/meta-oe/recipes-support/xrdp/xrdp_0.9.4.bb b/meta-oe/recipes-support/xrdp/xrdp_0.9.4.bb
index e7a77e4493..ccc8e359a7 100644
--- a/meta-oe/recipes-support/xrdp/xrdp_0.9.4.bb
+++ b/meta-oe/recipes-support/xrdp/xrdp_0.9.4.bb
@@ -15,6 +15,7 @@ SRC_URI = "git://github.com/neutrinolabs/xrdp.git \
            file://0001-Fix-sesman.ini-and-xrdp.ini.patch \
            file://0001-Added-req_distinguished_name-in-etc-xrdp-openssl.con.patch \
            file://0001-Fix-the-compile-error.patch \
+           file://0001-Fix-of-CVE-2017-16927.patch \
            "
 
 SRCREV = "c295dd61b882e8b56677cf12791f43634f9190b5"