Vulnerability CVE-2019-15297

Vulnerability Name:

CVE-2019-15297 (CCN-166667)

Assigned:

2019-09-05

Published:

2019-09-05

Updated:

2022-08-30

Summary:

res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash occurs because of a NULL session media object dereference.

CVSS v3 Severity:

6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

CVSS v2 Severity:

4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

Vulnerability Type:

CWE-476

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2019-15297

Source: CCN
Type: Asterisk Project Security Advisory - AST-2019-004
Crash when negotiating for T.38 with a declined stream

Source: CONFIRM
Type: Patch, Vendor Advisory
http://downloads.asterisk.org/pub/security/AST-2019-004.html

Source: MISC
Type: Patch, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/154371/Asterisk-Project-Security-Advisory-AST-2019-004.html

Source: MISC
Type: UNKNOWN
http://packetstormsecurity.com/files/161671/Asterisk-Project-Security-Advisory-AST-2021-006.html

Source: FULLDISC
Type: UNKNOWN
20210304 AST-2021-006: Crash when negotiating T.38 with a zero port

Source: CCN
Type: Asterisk Project Security Advisory - AST-2021-006
Crash when negotiating T.38 with a zero port

Source: XF
Type: UNKNOWN
asterisk-cve201915297-dos(166667)

Vulnerable Configuration:

Configuration 1:

cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 16.0.0 and <= 16.5.0)

OR cpe:/a:digium:asterisk:*:*:*:*:*:*:*:* (Version >= 15.0.0 and <= 15.7.3)

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.disco:def:2019152970000000	V	CVE-2019-15297 on Ubuntu 19.04 (disco) - medium.	2019-09-09
oval:com.ubuntu.bionic:def:2019152970000000	V	CVE-2019-15297 on Ubuntu 18.04 LTS (bionic) - medium.	2019-09-09
oval:com.ubuntu.xenial:def:2019152970000000	V	CVE-2019-15297 on Ubuntu 16.04 LTS (xenial) - medium.	2019-09-09

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