From 9ff501951e8a776661aeeb8bb6b9758476f6a6de Mon Sep 17 00:00:00 2001 From: Tobias Ronge Date: Thu, 14 Mar 2019 10:12:27 +0100 Subject: [PATCH] gstrtspconnection: Security loophole making heap overflow The former code allowed an attacker to create a heap overflow by sending a longer than allowed session id in a response and including a semicolon to change the maximum length. With this change, the parser will never go beyond 512 bytes. --- gst-libs/gst/rtsp/gstrtspconnection.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gst-libs/gst/rtsp/gstrtspconnection.c b/gst-libs/gst/rtsp/gstrtspconnection.c index 02b192cf4..a2c6a4ca6 100644 --- a/gst-libs/gst/rtsp/gstrtspconnection.c +++ b/gst-libs/gst/rtsp/gstrtspconnection.c @@ -2132,7 +2132,7 @@ build_next (GstRTSPBuilder * builder, GstRTSPMessage * message, maxlen = sizeof (conn->session_id) - 1; /* the sessionid can have attributes marked with ; * Make sure we strip them */ - for (i = 0; session_id[i] != '\0'; i++) { + for (i = 0; i < maxlen && session_id[i] != '\0'; i++) { if (session_id[i] == ';') { maxlen = i; /* parse timeout */ -- GitLab