CVE-2021-3156
Quick assessment
Affected
n/a n/a
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.
Sudo是一款使用于类Unix系统的，允许用户通过安全的方式使用特殊的权限执行命令的程序。 Sudo 1.9.5p2 之前版本存在缓冲区错误漏洞，攻击者可使用sudoedit -s和一个以单个反斜杠字符结束的命令行参数升级到root。
Public Exploits 3
Metasploit · 1
sudo_baron_samedit.rb [exploit]
In-the-Wild Activity Observed
cisa_kev · confirmed
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-3156
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.
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
Sudo 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sudo是一款使用于类Unix系统的，允许用户通过安全的方式使用特殊的权限执行命令的程序。 Sudo 1.9.5p2 之前版本存在缓冲区错误漏洞，攻击者可使用sudoedit -s和一个以单个反斜杠字符结束的命令行参数升级到root。
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)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | n/a | n/a | - |
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II. Public POCs for CVE-2021-3156
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | None | https://github.com/mr-r3b00t/CVE-2021-3156 | POC Details |
| 2 | None | https://github.com/nexcess/sudo_cve-2021-3156 | POC Details |
| 3 | CVE-2021-3156 | https://github.com/reverse-ex/CVE-2021-3156 | POC Details |
| 4 | None | https://github.com/unauth401/CVE-2021-3156 | POC Details |
| 5 | CVE-2021-3156 | https://github.com/ymrsmns/CVE-2021-3156 | POC Details |
| 6 | This simple bash script will patch the recently discovered sudo heap overflow vulnerability. | https://github.com/elbee-cyber/CVE-2021-3156-PATCHER | POC Details |
| 7 | 1day research effort | https://github.com/kernelzeroday/CVE-2021-3156-Baron-Samedit | POC Details |
| 8 | cve-2021-3156;sudo堆溢出漏洞；漏洞检测 | https://github.com/yaunsky/cve-2021-3156 | POC Details |
| 9 | None | https://github.com/baka9moe/CVE-2021-3156-Exp | POC Details |
| 10 | CVE-2021-3156 | https://github.com/ph4ntonn/CVE-2021-3156 | POC Details |
| 11 | None | https://github.com/binw2018/CVE-2021-3156-SCRIPT | POC Details |
| 12 | None | https://github.com/freeFV/CVE-2021-3156 | POC Details |
| 13 | Notes regarding CVE-2021-3156: Heap-Based Buffer Overflow in Sudo | https://github.com/mbcrump/CVE-2021-3156 | POC Details |
| 14 | PoC for CVE-2021-3156 (sudo heap overflow) | https://github.com/stong/CVE-2021-3156 | POC Details |
| 15 | checking CVE-2021-3156 vulnerability & patch script | https://github.com/nobodyatall648/CVE-2021-3156 | POC Details |
| 16 | None | https://github.com/blasty/CVE-2021-3156 | POC Details |
| 17 | None | https://github.com/teamtopkarl/CVE-2021-3156 | POC Details |
| 18 | 复现别人家的CVEs系列 | https://github.com/Q4n/CVE-2021-3156 | POC Details |
| 19 | Description Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character. | https://github.com/kal1gh0st/CVE-2021-3156 | POC Details |
| 20 | A docker environment to research CVE-2021-3156 | https://github.com/apogiatzis/docker-CVE-2021-3156 | POC Details |
| 21 | a simple script to patch CVE-2021-3156 (heap based buffer overflow via sudo). | https://github.com/voidlsd/CVE-2021-3156 | POC Details |
| 22 | Patch Script for CVE-2021-3156 Heap Overflow | https://github.com/Ashish-dawani/CVE-2021-3156-Patch | POC Details |
| 23 | None | https://github.com/SantiagoSerrao/ScannerCVE-2021-3156 | POC Details |
| 24 | CTF for HDE 64 students at See Security College. Exploit a JWT (web part) & CVE-2021-3156 (LPE part). | https://github.com/DanielAzulayy/CTF-2021 | POC Details |
| 25 | None | https://github.com/cdeletre/Serpentiel-CVE-2021-3156 | POC Details |
| 26 | CVE-2021-3156 Vagrant Lab | https://github.com/dinhbaouit/CVE-2021-3156 | POC Details |
| 27 | Root shell PoC for CVE-2021-3156 | https://github.com/CptGibbon/CVE-2021-3156 | POC Details |
| 28 | Custom version of sudo 1.8.3p1 with CVE-2021-3156 patches applied | https://github.com/perlun/sudo-1.8.3p1-patched | POC Details |
| 29 | None | https://github.com/1N53C/CVE-2021-3156-PoC | POC Details |
| 30 | CVE-2021-3156: Sudo heap overflow exploit for Debian 10 | https://github.com/0xdevil/CVE-2021-3156 | POC Details |
AI-Generated POC
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Vendor Advisories for CVE-2021-3156 (9)
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https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
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https://security.netapp.com/advisory/ntap-20210128-0002/ x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
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https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
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https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM vendor-advisory x_refsource_CISCO
Exploits & Public PoCs for CVE-2021-3156 (3)
Mailing List Discussions for CVE-2021-3156 (13)
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https://www.openwall.com/lists/oss-security/2021/01/26/3 x_refsource_MISC
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/ vendor-advisory x_refsource_FEDORA
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http://seclists.org/fulldisclosure/2024/Feb/3 mailing-list
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oss-security - Baron Samedit: Heap-based buffer overflow in Sudo (CVE-2021-3156) mailing-list x_refsource_MLIST
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Security Blog Posts for CVE-2021-3156 (2)
Other References for CVE-2021-3156 (3)
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https://www.synology.com/security/advisory/Synology_SA_21_02 x_refsource_CONFIRM
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https://www.sudo.ws/stable.html#1.9.5p2 x_refsource_CONFIRM
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https://kc.mcafee.com/corporate/index?page=content&id=SB10348 x_refsource_CONFIRM
Same Patch Batch · n/a · 2021-01-26 · 42 CVEs total
| CVE-2021-22159 | Proofpoint Insider Threat Management Server 安全漏洞 | |
| CVE-2020-8295 | Nextcloud 资源管理错误漏洞 | |
| CVE-2020-23447 | newbee-mall 跨站脚本漏洞 | |
| CVE-2020-23448 | newbee-mall 授权问题漏洞 | |
| CVE-2020-23449 | newbee-mall 访问控制错误漏洞 | |
| CVE-2020-35263 | Egavilanmedia User Registration & Login System SQL注入漏洞 | |
| CVE-2020-13582 | Micrium uC-HTTP 代码问题漏洞 | |
| CVE-2020-27274 | Honeywell OPC UA Tunneller 代码问题漏洞 | |
| CVE-2020-27299 | Honeywell OPC UA Tunneller 缓冲区错误漏洞 | |
| CVE-2020-27297 | Honeywell OPC UA Tunneller 缓冲区错误漏洞 | |
| CVE-2020-27295 | Honeywell OPC UA Tunneller 资源管理错误漏洞 | |
| CVE-2020-8293 | Nextcloud 资源管理错误漏洞 | |
| CVE-2021-3308 | Xen 安全漏洞 | |
| CVE-2021-3309 | Wekan 信任管理问题漏洞 | |
| CVE-2021-26271 | CKEditor 安全漏洞 | |
| CVE-2021-26272 | CKEditor 安全漏洞 | |
| CVE-2020-23774 | 苏州华兆科技 Winmail 跨站脚本漏洞 | |
| CVE-2020-23776 | 苏州华兆科技 Winmail 代码问题漏洞 | |
| CVE-2021-3317 | KLog 命令注入漏洞 | |
| CVE-2021-3165 | SmartAgent 安全漏洞 |
Showing top 20 of 42 CVEs. View all on vendor page → →
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V. Comments for CVE-2021-3156
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