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CVE-2020-15260— Existing TLS connections can be reused without checking remote hostname

Quick assessment

Affected
pjsip pjproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sauwming pjproject是 Sauwming开源的一个应用软件。将信令协议（SIP）与丰富的多媒体框架和NAT遍历功能结合在一起，成为可移植的高级API，适用于从台式机，嵌入式系统到手机等几乎所有类型的系统。 pjproject 存在安全漏洞，该漏洞源于缺乏远程主机名身份验证。

CVSS 6.8 · Medium EPSS 0.99% · P61
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I. Basic Information for CVE-2020-15260

Vulnerability Information
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Vulnerability Title
Existing TLS connections can be reused without checking remote hostname
Source: CVE Program / CVE List V5
Vulnerability Description
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In version 2.10 and earlier, PJSIP transport can be reused if they have the same IP address + port + protocol. However, this is insufficient for secure transport since it lacks remote hostname authentication. Suppose we have created a TLS connection to `sip.foo.com`, which has an IP address `100.1.1.1`. If we want to create a TLS connection to another hostname, say `sip.bar.com`, which has the same IP address, then it will reuse that existing connection, even though `100.1.1.1` does not have certificate to authenticate as `sip.bar.com`. The vulnerability allows for an insecure interaction without user awareness. It affects users who need access to connections to different destinations that translate to the same address, and allows man-in-the-middle attack if attacker can route a connection to another destination such as in the case of DNS spoofing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Sauwming pjproject 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sauwming pjproject是 Sauwming开源的一个应用软件。将信令协议（SIP）与丰富的多媒体框架和NAT遍历功能结合在一起，成为可移植的高级API，适用于从台式机，嵌入式系统到手机等几乎所有类型的系统。 pjproject 存在安全漏洞，该漏洞源于缺乏远程主机名身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pjsip pjproject <= 2.10 -

II. Public POCs for CVE-2020-15260

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III. Intelligence Information for CVE-2020-15260

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Patches & Fixes for CVE-2020-15260 (2)

Vendor Advisories for CVE-2020-15260 (1)

IV. Related Vulnerabilities

Same product: pjproject
Same vendor: pjsip
Same weakness: CWE-297

V. Comments for CVE-2020-15260

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