Multiple vulnerabilities in Asterisk



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-31878
CVE-2021-32558
CWE-ID CWE-399
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions

Certified Asterisk
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor Digium (Linux Support Services)

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource management error

EUVDB-ID: #VU55286

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31878

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the application in PJSIP channel driver in res_pjsip_session.c. A remote user can send a re-INVITE message without SDP after Asterisk has sent a BYE request and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Asterisk Open Source: 16.17.0 rc1 - 18.5.0 rc1

CPE2.3 External links

https://downloads.asterisk.org/pub/security/AST-2021-007.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU55294

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-32558

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the IAX2 channel driver chan_iax2.c. A remote attacker can send a packet that contains an unsupported media format and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Asterisk Open Source: 13.23.0 rc1 - 18.5.0 rc1

Certified Asterisk: 16.3-cert1 - 16.8-cert9

CPE2.3 External links

https://downloads.asterisk.org/pub/security/AST-2021-008.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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