Sangoma Asterisk/Certified Asterisk T.38 Re-Invite res_pjsip_t38 denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Sangoma Asterisk and Certified Asterisk. The affected element is the function res_pjsip_t38 of the component T.38 Re-Invite Handler. The manipulation results in denial of service. This vulnerability is identified as CVE-2021-46837. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Sangoma Asterisk and Certified Asterisk (Communications System) (unknown version). Affected is the function res_pjsip_t38 of the component T.38 Re-Invite Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.

The weakness was released 08/30/2022 as AST-2021-006. The advisory is shared for download at downloads.asterisk.org. This vulnerability is traded as CVE-2021-46837 since 08/30/2022. There are known technical details, but no exploit is available.

Upgrading eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/30/2022 🔍
08/30/2022 +0 days 🔍
08/30/2022 +0 days 🔍
10/10/2022 +41 days 🔍

Sourcesinfo

Advisory: AST-2021-006
Status: Confirmed

CVE: CVE-2021-46837 (🔍)
GCVE (CVE): GCVE-0-2021-46837
GCVE (VulDB): GCVE-100-207576

Entryinfo

Created: 08/30/2022 13:32
Updated: 10/10/2022 08:34
Changes: 08/30/2022 13:32 (41), 10/10/2022 08:34 (11)
Complete: 🔍
Cache ID: 216::103

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