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CVE-2021-23351— Denial of Service (DoS)

Quick assessment

Affected
n/a github.com/pires/go-proxyproto
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.

Pires go-proxyproto是 （Pires）开源的一个应用软件。提供一种安全的方式，可以跨NAT或TCP代理的多层安全地传输连接信息功能。 github.com/pires/go-proxyproto before 0.5.0 存在安全漏洞，该漏洞源于在代码中没有实现限制，V1 header可以使用此代码耗尽服务器进程中的内存，并创建一个DoS。

CVSS 4.4 · Medium EPSS 1.87% · P78

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-23351

Vulnerability Information
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Vulnerability Title
Denial of Service (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
The package github.com/pires/go-proxyproto before 0.5.0 are vulnerable to Denial of Service (DoS) via the parseVersion1() function. The reader in this package is a default bufio.Reader wrapping a net.Conn. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Pires go-proxyproto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pires go-proxyproto是 （Pires）开源的一个应用软件。提供一种安全的方式，可以跨NAT或TCP代理的多层安全地传输连接信息功能。 github.com/pires/go-proxyproto before 0.5.0 存在安全漏洞，该漏洞源于在代码中没有实现限制，V1 header可以使用此代码耗尽服务器进程中的内存，并创建一个DoS。
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
- github.com/pires/go-proxyproto unspecified ~ 0.5.0 -

II. Public POCs for CVE-2021-23351

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III. Intelligence Information for CVE-2021-23351

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Patches & Fixes for CVE-2021-23351 (2)

Vendor Advisories for CVE-2021-23351 (1)

Mailing List Discussions for CVE-2021-23351 (2)

Other References for CVE-2021-23351 (1)

Same Patch Batch · n/a · 2021-03-08 · 8 CVEs total

CVE-2021-26788 Oryx Embedded CycloneTCP 输入验证错误漏洞
CVE-2021-27222 Time in Status 跨站脚本漏洞
CVE-2020-23967 Dr.Web Security Space 数据伪造问题漏洞
CVE-2020-27574 Maxum Rumpus 跨站请求伪造漏洞
CVE-2020-27575 Maxum Rumpus 命令注入漏洞
CVE-2020-27576 Maxum Rumpus 跨站脚本漏洞
CVE-2020-27838 Red Hat Keycloak 授权问题漏洞

IV. Related Vulnerabilities

Same product: github.com/pires/go-proxyproto
Same vendor: n/a

V. Comments for CVE-2021-23351

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