CVE-2021-3156

HIGHCISA KEV

7.8

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.

CVE Details

CVSS v3.1 Score7.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published1/26/2021

Last Modified11/10/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorSudo

ProductSudo

Vulnerability NameSudo Heap-Based Buffer Overflow Vulnerability

KEV Date Added2022-04-06

Remediation Due Date2022-04-27

Ransomware UseUnknown

Affected Products

beyondtrust:privilege_management_for_macbeyondtrust:privilege_management_for_unix\/linuxdebian:debian_linuxfedoraproject:fedoramcafee:web_gatewaynetapp:active_iq_unified_managernetapp:cloud_backupnetapp:hci_management_nodenetapp:oncommand_unified_manager_core_packagenetapp:ontap_select_deploy_administration_utilitynetapp:ontap_toolsnetapp:solidfireoracle:communications_performance_intelligence_centeroracle:micros_compact_workstation_3oracle:micros_compact_workstation_3_firmwareoracle:micros_es400oracle:micros_es400_firmwareoracle:micros_kitchen_display_systemoracle:micros_kitchen_display_system_firmwareoracle:micros_workstation_5aoracle:micros_workstation_5a_firmwareoracle:micros_workstation_6oracle:micros_workstation_6_firmwareoracle:tekelec_platform_distributionsudo_project:sudosynology:diskstation_managersynology:diskstation_manager_unified_controllersynology:skynassynology:skynas_firmwaresynology:vs960hdsynology:vs960hd_firmware

Weaknesses (CWE)

CWE-193CWE-193

References

http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html(cve@mitre.org)

http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html(cve@mitre.org)

http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html(cve@mitre.org)

http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html(cve@mitre.org)

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html(cve@mitre.org)

http://seclists.org/fulldisclosure/2021/Feb/42(cve@mitre.org)

http://seclists.org/fulldisclosure/2021/Jan/79(cve@mitre.org)

http://seclists.org/fulldisclosure/2024/Feb/3(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/01/26/3(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/01/27/1(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/01/27/2(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/02/15/1(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/09/14/2(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2024/01/30/6(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2024/01/30/8(cve@mitre.org)

https://kc.mcafee.com/corporate/index?page=content&id=SB10348(cve@mitre.org)

https://lists.debian.org/debian-lts-announce/2021/01/msg00022.html(cve@mitre.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/(cve@mitre.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/(cve@mitre.org)

https://security.gentoo.org/glsa/202101-33(cve@mitre.org)

https://security.netapp.com/advisory/ntap-20210128-0001/(cve@mitre.org)

https://security.netapp.com/advisory/ntap-20210128-0002/(cve@mitre.org)

https://support.apple.com/kb/HT212177(cve@mitre.org)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM(cve@mitre.org)

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(cve@mitre.org)

https://www.debian.org/security/2021/dsa-4839(cve@mitre.org)

https://www.kb.cert.org/vuls/id/794544(cve@mitre.org)

https://www.openwall.com/lists/oss-security/2021/01/26/3(cve@mitre.org)

https://www.oracle.com//security-alerts/cpujul2021.html(cve@mitre.org)

https://www.oracle.com/security-alerts/cpuapr2022.html(cve@mitre.org)

https://www.oracle.com/security-alerts/cpuoct2021.html(cve@mitre.org)

https://www.sudo.ws/stable.html#1.9.5p2(cve@mitre.org)

https://www.synology.com/security/advisory/Synology_SA_21_02(cve@mitre.org)

https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156(cve@mitre.org)

http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html(af854a3a-2127-422b-91ae-364da2661108)

http://seclists.org/fulldisclosure/2021/Feb/42(af854a3a-2127-422b-91ae-364da2661108)

http://seclists.org/fulldisclosure/2021/Jan/79(af854a3a-2127-422b-91ae-364da2661108)

http://seclists.org/fulldisclosure/2024/Feb/3(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2021/01/26/3(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2021/01/27/1(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2021/01/27/2(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2021/02/15/1(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2021/09/14/2(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2024/01/30/6(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2024/01/30/8(af854a3a-2127-422b-91ae-364da2661108)

https://kc.mcafee.com/corporate/index?page=content&id=SB10348(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2021/01/msg00022.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/(af854a3a-2127-422b-91ae-364da2661108)

https://security.gentoo.org/glsa/202101-33(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210128-0001/(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210128-0002/(af854a3a-2127-422b-91ae-364da2661108)

https://support.apple.com/kb/HT212177(af854a3a-2127-422b-91ae-364da2661108)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM(af854a3a-2127-422b-91ae-364da2661108)

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(af854a3a-2127-422b-91ae-364da2661108)

https://www.debian.org/security/2021/dsa-4839(af854a3a-2127-422b-91ae-364da2661108)

https://www.kb.cert.org/vuls/id/794544(af854a3a-2127-422b-91ae-364da2661108)

https://www.openwall.com/lists/oss-security/2021/01/26/3(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com//security-alerts/cpujul2021.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpuapr2022.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpuoct2021.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.sudo.ws/stable.html#1.9.5p2(af854a3a-2127-422b-91ae-364da2661108)

https://www.synology.com/security/advisory/Synology_SA_21_02(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3156(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.