Denial of service in Asterisk

1) NULL pointer dereference

EUVDB-ID: #VU96902

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-2024-42491

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error when handling malformed Contact or Record-Route URI in an incoming SIP request. A remote attacker can send a specially crafted SIP request to the server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Certified Asterisk: 18.9-cert1 - 20.7-cert2

Asterisk Open Source: 18.0.0 rc1 - 21.4.2

CPE2.3

• cpe:2.3:a:digium_linux_support_services:certified_asterisk:18.9-cert11:*:*:*:*:rv110w_wireless-n_vpn_firewall:*:*
• cpe:2.3:a:digium_linux_support_services:certified_asterisk:20.7-cert2:*:*:*:*:rv110w_wireless-n_vpn_firewall:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:18.24.2:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:19.8.1:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:20.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:20.1.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:20.1.0:rc2:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:20.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:20.2.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:digium_linux_support_services:asterisk:20.2.0:*:*:*:*:*:*:*

External links

https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9

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.