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CVE-2021-37706— Potential integer underflow upon receiving STUN message in PJSIP

Quick assessment

Affected
pjsip pjproject
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PJSIP是一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP 存在数字错误漏洞，该漏洞源于传入的 STUN 消息包含 ERROR-CODE 属性，则在执行减法运算之前不会检查标头长度，这可能会导致整数下溢情况。 此问题会影响所有使用 STUN 的用户。 位于受害者网络中的恶意行为者可能会伪造并发送特制的 UDP (STUN) 消息，该消息可以在受害者的机器上远程执行任意代码。

CVSS 7.3 · High EPSS 4.58% · P91
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I. Basic Information for CVE-2021-37706

Vulnerability Information
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Vulnerability Title
Potential integer underflow upon receiving STUN message in PJSIP
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 affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
PJSIP 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PJSIP是一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP 存在数字错误漏洞，该漏洞源于传入的 STUN 消息包含 ERROR-CODE 属性，则在执行减法运算之前不会检查标头长度，这可能会导致整数下溢情况。 此问题会影响所有使用 STUN 的用户。 位于受害者网络中的恶意行为者可能会伪造并发送特制的 UDP (STUN) 消息，该消息可以在受害者的机器上远程执行任意代码。
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 <= 2.11.1 -

II. Public POCs for CVE-2021-37706

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III. Intelligence Information for CVE-2021-37706

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Patches & Fixes for CVE-2021-37706 (1)

Vendor Advisories for CVE-2021-37706 (3)

Exploits & Public PoCs for CVE-2021-37706 (1)

Mailing List Discussions for CVE-2021-37706 (4)

IV. Related Vulnerabilities

Same product: pjproject
Same vendor: pjsip
Same weakness: CWE-191

V. Comments for CVE-2021-37706

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