CVE-2021-3156 (GCVE-0-2021-3156)
Vulnerability from cvelistv5
Published
2021-01-26 00:00
Modified
2025-10-21 23:35
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Summary
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.
References
https://lists.debian.org/debian-lts-announce/2021/01/msg00022.html mailing-list
http://seclists.org/fulldisclosure/2021/Jan/79 mailing-list
http://www.openwall.com/lists/oss-security/2021/01/26/3 mailing-list
https://security.gentoo.org/glsa/202101-33 vendor-advisory
https://www.debian.org/security/2021/dsa-4839 vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/ vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/ vendor-advisory
http://www.openwall.com/lists/oss-security/2021/01/27/1 mailing-list
http://www.openwall.com/lists/oss-security/2021/01/27/2 mailing-list
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM vendor-advisory
https://www.kb.cert.org/vuls/id/794544 third-party-advisory
http://seclists.org/fulldisclosure/2021/Feb/42 mailing-list
http://www.openwall.com/lists/oss-security/2021/02/15/1 mailing-list
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.sudo.ws/stable.html#1.9.5p2
https://www.openwall.com/lists/oss-security/2021/01/26/3
http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html
https://security.netapp.com/advisory/ntap-20210128-0002/
https://security.netapp.com/advisory/ntap-20210128-0001/
http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html
http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html
http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html
https://support.apple.com/kb/HT212177
https://kc.mcafee.com/corporate/index?page=content&id=SB10348
https://www.beyondtrust.com/blog/entry/security-advisory-privilege-management-for-unix-linux-pmul-basic-and-privilege-management-for-mac-pmm-affected-by-sudo-vulnerability
https://www.synology.com/security/advisory/Synology_SA_21_02
http://www.openwall.com/lists/oss-security/2021/09/14/2 mailing-list
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
http://www.openwall.com/lists/oss-security/2024/01/30/8 mailing-list
http://www.openwall.com/lists/oss-security/2024/01/30/6 mailing-list
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
http://seclists.org/fulldisclosure/2024/Feb/3 mailing-list
https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156
Impacted products
Vendor Product Version
n/a n/a Version: n/a
CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2022-04-06

Due date: 2022-04-27

Required action: Apply updates per vendor instructions.

Used in ransomware: Unknown

Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-3156

Show details on NVD website

To clipboard 

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      "product": "Sudo",
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      "shortDescription": "Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.",
      "vendorProject": "Sudo",
      "vulnerabilityName": "Sudo Heap-Based Buffer Overflow Vulnerability"
    },
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      "cveMetadata": "{\"cveId\": \"CVE-2021-3156\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:35:29.600Z\", \"dateReserved\": \"2021-01-15T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2021-01-26T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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