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CVE-2021-43804— Out-of-bounds read when parsing RTCP BYE message in PJSIP

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.

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 存在缓冲区错误漏洞，该漏洞源于如果传入的"RTCP BYE"消息包含原因长度，则不会根据实际接收到的数据包大小检查此声明的长度，会导致越界读取访问。

CVSS 7.3 · High EPSS 2.13% · P81
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I. Basic Information for CVE-2021-43804

Vulnerability Information
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Vulnerability Title
Out-of-bounds read when parsing RTCP BYE 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 RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. 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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
PJSIP 缓冲区错误漏洞
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 存在缓冲区错误漏洞，该漏洞源于如果传入的"RTCP BYE"消息包含原因长度，则不会根据实际接收到的数据包大小检查此声明的长度，会导致越界读取访问。
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-2021-43804

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III. Intelligence Information for CVE-2021-43804

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Patches & Fixes for CVE-2021-43804 (1)

Vendor Advisories for CVE-2021-43804 (3)

Mailing List Discussions for CVE-2021-43804 (3)

IV. Related Vulnerabilities

Same product: pjproject
Same vendor: pjsip
Same weakness: CWE-125

V. Comments for CVE-2021-43804

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