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CVE-2021-35211— Serv-U Remote Memory Escape Vulnerability

Quick assessment

Affected
SolarWinds Serv-U Managed File Transfer Server and Serv-U Secured FTP
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SolarWinds Serv-U FTP Server是美国SolarWinds公司的一套FTP和MFT文件传输软件。 SolarWinds Serv-U FTP Server 存在缓冲区错误漏洞，该漏洞源于边界错误而存在漏洞。攻击者可利用该漏洞向server - u服务器发送专门设计的请求，触发内存损坏并在目标系统上执行任意代码。

CVSS 9.0 · Critical KEV · Ransomware EPSS 91.16% · P100

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-35211

Vulnerability Information
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Vulnerability Title
Serv-U Remote Memory Escape Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
SolarWinds Serv-U FTP Server 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SolarWinds Serv-U FTP Server是美国SolarWinds公司的一套FTP和MFT文件传输软件。 SolarWinds Serv-U FTP Server 存在缓冲区错误漏洞，该漏洞源于边界错误而存在漏洞。攻击者可利用该漏洞向server - u服务器发送专门设计的请求，触发内存损坏并在目标系统上执行任意代码。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
SolarWinds Serv-U Managed File Transfer Server and Serv-U Secured FTP SolarWinds Serv-U ~ 15.2.3 HF1 -

II. Public POCs for CVE-2021-35211

# POC Description Source Link Shenlong Link
1 Simple Serv-U CVE-2021-35211 PoC https://github.com/NattiSamson/Serv-U-CVE-2021-35211 POC Details
2 Serv-U-FTP CVE-2021-35211 exploit https://github.com/0xhaggis/CVE-2021-35211 POC Details
3 None https://github.com/BishopFox/CVE-2021-35211 POC Details
4 SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 contain a remote memory escape caused remote code execution vulnerability, letting attackers gain privileged access, exploit requires remote attacker to send crafted memory operations. https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2021/CVE-2021-35211.yaml POC Details
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III. Intelligence Information for CVE-2021-35211

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Security Blog Posts for CVE-2021-35211 (1)

Other References for CVE-2021-35211 (1)

IV. Related Vulnerabilities

Same vendor: SolarWinds

V. Comments for CVE-2021-35211

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