asterisk -- Remote crash possible when negotiating T.38

2021-02-0500:00:00

vuxml.freebsd.org

asterisk

t.38

renegotiation

remote crash

sdp

declined stream

unix

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.002

Percentile

56.2%

JSON

The Asterisk project reports:

When re-negotiating for T.38 if the initial remote
response was delayed just enough Asterisk would send both
audio and T.38 in the SDP. If this happened, and the
remote responded with a declined T.38 stream then Asterisk
would crash.

OSVersionArchitecturePackageVersionFilename
FreeBSDanynoarchasterisk16= 16.15.0UNKNOWN
FreeBSDanynoarchasterisk16< 16.16.1UNKNOWN
FreeBSDanynoarchasterisk18= 18.1.0UNKNOWN
FreeBSDanynoarchasterisk18< 18.2.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
FreeBSD	any	noarch	asterisk16	= 16.15.0	UNKNOWN
FreeBSD	any	noarch	asterisk16	< 16.16.1	UNKNOWN
FreeBSD	any	noarch	asterisk18	= 18.1.0	UNKNOWN
FreeBSD	any	noarch	asterisk18	< 18.2.1	UNKNOWN