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CVE-2020-13111

Quick assessment

Affected
n/a n/a
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.

NaviServer是一款使用C语言和Tcl语言编写的Web服务器。它支持反向代理、IPv6、动态线程池映射和基于OpenSSL的加密等功能。 NaviServer 4.99.4版本至4.99.19版本中的nsd/driver.c文件的‘ChunkedDecode’函数存在安全漏洞，该漏洞源于程序没有正确验证块的长度。远程攻击者可通过发送特制的分块传输请求利用该漏洞导致拒绝服务（进程崩溃）。

AI Predicted 7.5 Difficulty: Trivial EPSS 1.44% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-13111

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
NaviServer 4.99.4 to 4.99.19 allows denial of service due to the nsd/driver.c ChunkedDecode function not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
NaviServer 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NaviServer是一款使用C语言和Tcl语言编写的Web服务器。它支持反向代理、IPv6、动态线程池映射和基于OpenSSL的加密等功能。 NaviServer 4.99.4版本至4.99.19版本中的nsd/driver.c文件的‘ChunkedDecode’函数存在安全漏洞，该漏洞源于程序没有正确验证块的长度。远程攻击者可通过发送特制的分块传输请求利用该漏洞导致拒绝服务（进程崩溃）。
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
- n/a n/a -

II. Public POCs for CVE-2020-13111

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III. Intelligence Information for CVE-2020-13111

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Patches & Fixes for CVE-2020-13111 (1)

Other References for CVE-2020-13111 (1)

Same Patch Batch · n/a · 2020-05-16 · 5 CVEs total

CVE-2020-13121 Submitty 输入验证错误漏洞
CVE-2020-13118 Mikrotik-Router-Monitoring-System SQL注入漏洞
CVE-2020-13110 kerberos package for Node.js 代码问题漏洞
CVE-2020-13109 SETA Morita Shogi 64 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a

V. Comments for CVE-2020-13111

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