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coturn: access control bypass via loopback peer address

Published on Jan 11, 2021 in , , ,

Description

By default coturn does not allow peers to connect and relay packets to loopback addresses in the range of 127.x.x.x. However, it was observed that when sending a CONNECT request with the XOR-PEER-ADDRESS value of 0.0.0.0, a successful response was received and subsequently, CONNECTIONBIND also received a successful response. Coturn then was able to relay packets to local network services.

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sngrep: stack overflow via malformed SDP connection address

Published on Nov 20, 2020 in , ,

Description

When sending a specially crafted SIP message with a malformed SDP connection address, sngrep crashes due to a stack overflow. The following backtrace was generated during our tests:

(gdb) bt
#0  __GI_raise (sig=sig@entry=6)
    at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7ced859 in __GI_abort () at abort.c:79
#2  0x00007ffff7d583ee in __libc_message (
    action=action@entry=do_abort, 
    fmt=fmt@entry=0x7ffff7e8207c "*** %s ***: terminated\n")
    at ../sysdeps/posix/libc_fatal.c:155
#3  0x00007ffff7dfa9ba in __GI___fortify_fail (
    msg=msg@entry=0x7ffff7e82064 "stack smashing detected")
    at fortify_fail.c:26
#4  0x00007ffff7dfa986 in __stack_chk_fail () at stack_chk_fail.c:24
#5  0x0000555555560651 in sip_parse_msg_media (msg=0x7ffff0046c60, 
    payload=<optimized out>) at sip.c:740
#6  0x3131313131313131 in ?? ()
#7  0x3131313131313131 in ?? ()

The issue was originally discovered during OpenSIPIt; tracked down and analyzed for severity and impact later.

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sngrep: buffer overflow via malformed SDP media type

Published on Nov 20, 2020 in , , ,

Description

When sending a specially crafted SIP message with a malformed SDP media type, sngrep crashes due to a buffer overflow. The following backtrace was generated during our tests:

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7ced859 in __GI_abort () at abort.c:79
#2  0x00007ffff7d583ee in __libc_message (action=action@entry=do_abort, 
    fmt=fmt@entry=0x7ffff7e8207c "*** %s ***: terminated\n")
    at ../sysdeps/posix/libc_fatal.c:155
#3  0x00007ffff7dfa9ba in __GI___fortify_fail (
    msg=msg@entry=0x7ffff7e82012 "buffer overflow detected") at fortify_fail.c:26
#4  0x00007ffff7df9256 in __GI___chk_fail () at chk_fail.c:28
#5  0x00007ffff7df8b36 in __strcpy_chk (dest=0x7ffff00306f2 "", 
    src=0x7ffff79fcad1 'A' <repeats 200 times>..., destlen=destlen@entry=15)
    at strcpy_chk.c:30
#6  0x0000555555563f72 in strcpy (__src=<optimized out>, __dest=<optimized out>)
    at /usr/include/x86_64-linux-gnu/bits/string_fortified.h:90
#7  media_set_type (media=<optimized out>, type=<optimized out>) at media.c:65
#8  0x0000000000000000 in ?? ()

The issue was originally discovered during OpenSIPIt; tracked down and analyzed for severity and impact later.

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Asterisk: crash via INVITE flood over TCP

Published on Nov 6, 2020 in , , ,

Description

When an Asterisk instance is flooded with INVITE messages over TCP, it was observed that after some time Asterisk crashes due to a segmentation fault. The backtrace generated after the crash is:

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Kamailio: header smuggling via remove_hf bypass

Published on Sep 1, 2020 in , ,

Description

Kamailio is often configured to remove certain special internal SIP headers from untrusted traffic to protect against header injection attacks by making use of the remove_hf function from the Kamailio textops module. These SIP headers were typically set through Kamailio which are then used downstream, e.g. by a media service based on Asterisk, to affect internal business logic decisions. During our tests and research, we noticed that the removal of these headers can be bypassed by injecting whitespace characters at the end of the header name.

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Kamailio: off-by-one heap overflow

Published on Mar 19, 2018 in , , , ,

Description

A specially crafted REGISTER message with a malformed branch or From tag triggers an off-by-one heap overflow.

Impact

Abuse of this vulnerability leads to denial of service in Kamailio. Further research may show that exploitation leads to remote code execution.

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Asterisk PJSIP: stack corruption via large Accept header in SUBSCRIBE

Published on Feb 22, 2018 in , , , , ,

Description

A large SUBSCRIBE message with multiple malformed Accept headers will crash Asterisk due to stack corruption.

Impact

Abuse of this vulnerability leads to denial of service in Asterisk when chan_pjsip is in use. Brief analysis indicates that this is an exploitable vulnerability that may lead to remote code execution.

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Asterisk PJSIP: crash via repeated INVITE messages over TCP/TLS

Published on Feb 22, 2018 in , , , ,

Description

A crash occurs when a number of INVITE messages are sent over TCP or TLS and then the connection is suddenly closed. This issue leads to a segmentation fault.

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Asterisk PJSIP: crash via invalid SDP media format description

Published on Feb 22, 2018 in , , , ,

Description

A specially crafted SDP message body with an invalid media format description causes a segmentation fault in asterisk using chan_pjsip.

Impact

Abuse of this vulnerability leads to denial of service in Asterisk when chan_pjsip is in use.

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Asterisk PJSIP: crash via invalid SDP fmtp attribute

Published on Feb 22, 2018 in , , , ,

Description

A specially crafted SDP message body with an invalid fmtp attribute causes a segmentation fault in asterisk using chan_pjsip.

Impact

Abuse of this vulnerability leads to denial of service in Asterisk when chan_pjsip is in use.

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