#VU62781 Improper validation of certificate with host mismatch in pjsip - CVE-2020-15260

Vulnerability identifier: #VU62781

Vulnerability risk: Medium

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

CVE-ID: CVE-2020-15260

CWE-ID: CWE-297

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pjsip
Universal components / Libraries / Libraries used by multiple products

Vendor: pjsip

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper remote hostname authentication. A remote attacker can perform a man-in-the-middle attack and route a connection to another destination.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

pjsip: 2.0 - 2.10

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External links
https://github.com/pjsip/pjproject/commit/67e46c1ac45ad784db5b9080f5ed8b133c122872
https://github.com/pjsip/pjproject/pull/2663
https://github.com/pjsip/pjproject/security/advisories/GHSA-8hcp-hm38-mfph

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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.