Buffer overflow in asterisk (Alpine package)

1) Buffer overflow

EUVDB-ID: #VU50964

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-35776

CWE-ID: CWE-120 - Buffer overflow

Exploit availability: No

Description

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

A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.

Mitigation

Install update from vendor's website.

Vulnerable software versions

asterisk (Alpine package): 16.14.1-r0

CPE2.3

• cpe:2.3:o:alpine:asterisk_alpine_package:16.14.1-r0:*:*:*:*:alpine_linux:*:3.11

External links

https://git.alpinelinux.org/aports/commit/?id=2a8bd0c3ec7d7286dd026c2535f523ce889ecda4
https://git.alpinelinux.org/aports/commit/?id=8b4dd3e383247c88e9ff182557e096d12a052634
https://git.alpinelinux.org/aports/commit/?id=9d426cf7a7701ee6707224d3e9f6d07553a56de1

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.