exploit the possibilities

WebRTC usrsctp Incorrect Call

WebRTC usrsctp Incorrect Call
Posted Jul 31, 2020
Authored by Google Security Research

When usrsctp is used with a custom transport, an address must be provided to usrsctp_conninput be used as the source and destination address of the incoming packet. WebRTC uses the address of the SctpTransport instance for this value. Unfortunately, this value is often transmitted to the peer, for example to validate signing of the cookie. This could allow an attacker access to the location in memory of the SctpTransport of a peer, bypassing ASLR.

tags | advisory
advisories | CVE-2020-6514
MD5 | 6a5a0cbe8a76c5e374b2d723099f60cd

WebRTC usrsctp Incorrect Call

Change Mirror Download
WebRTC: usrsctp is called with pointer as network address

When usrsctp is used with a custom transport, an address must be provided to usrsctp_conninput be used as the source and destination address of the incoming packet. WebRTC uses the address of the SctpTransport instance for this value. Unfortunately, this value is often transmitted to the peer, for example to validate signing of the cookie. This could allow an attacker access to the location in memory of the SctpTransport of a peer, bypassing ASLR.

To reproduce, place the following code on line 9529 of sctp_output.c. This will output the peer's address to the log:

struct sctp_state_cookie cookie2;
struct sctp_state_cookie* cookie3;
cookie3 = sctp_get_next_param(cookie, 4, &cookie2, sizeof(struct sctp_state_cookie));


LOGE(\"COOKIE INITACK ADDRESS %llx laddress %llx\", *((long long*)cookie3->address), *((long long*)cookie3->address));

Or, view the SCTP packets sent by WebRTC before they are sent to the encryption layer. They are full of pointers.

This bug is subject to a 90 day disclosure deadline. After 90 days elapse,
the bug report will become visible to the public. The scheduled disclosure
date is 2020-Jul-28. Disclosure at an earlier date is possible if
agreed upon by all parties.


Related CVE Numbers: CVE-2020-6514.



Found by: deadbeef@chromium.org

Login or Register to add favorites

File Archive:

October 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Oct 1st
    25 Files
  • 2
    Oct 2nd
    13 Files
  • 3
    Oct 3rd
    1 Files
  • 4
    Oct 4th
    1 Files
  • 5
    Oct 5th
    15 Files
  • 6
    Oct 6th
    15 Files
  • 7
    Oct 7th
    15 Files
  • 8
    Oct 8th
    11 Files
  • 9
    Oct 9th
    3 Files
  • 10
    Oct 10th
    1 Files
  • 11
    Oct 11th
    1 Files
  • 12
    Oct 12th
    8 Files
  • 13
    Oct 13th
    12 Files
  • 14
    Oct 14th
    23 Files
  • 15
    Oct 15th
    4 Files
  • 16
    Oct 16th
    13 Files
  • 17
    Oct 17th
    1 Files
  • 18
    Oct 18th
    1 Files
  • 19
    Oct 19th
    27 Files
  • 20
    Oct 20th
    41 Files
  • 21
    Oct 21st
    18 Files
  • 22
    Oct 22nd
    16 Files
  • 23
    Oct 23rd
    2 Files
  • 24
    Oct 24th
    1 Files
  • 25
    Oct 25th
    1 Files
  • 26
    Oct 26th
    17 Files
  • 27
    Oct 27th
    19 Files
  • 28
    Oct 28th
    0 Files
  • 29
    Oct 29th
    0 Files
  • 30
    Oct 30th
    0 Files
  • 31
    Oct 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close