Vulnerability DatabaseCVE-2021-3156
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CVE-2021-3156
January 26, 2021
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.
Related Resources (38)
http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html
https://security-tracker.debian.org/tracker/CVE-2021-3156
http://www.openwall.com/lists/oss-security/2021/01/27/2
https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156
https://security.netapp.com/advisory/ntap-20210128-0002/
https://support.apple.com/kb/HT212177
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/
https://security.netapp.com/advisory/ntap-20210128-0001/
http://www.openwall.com/lists/oss-security/2021/01/26/3
http://www.openwall.com/lists/oss-security/2021/02/15/1
http://seclists.org/fulldisclosure/2021/Jan/79
https://www.openwall.com/lists/oss-security/2021/01/26/3
https://www.kb.cert.org/vuls/id/794544
http://www.openwall.com/lists/oss-security/2024/01/30/8
http://seclists.org/fulldisclosure/2021/Feb/42
https://security.gentoo.org/glsa/202101-33
http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html
http://www.openwall.com/lists/oss-security/2024/01/30/6
http://seclists.org/fulldisclosure/2024/Feb/3
https://kc.mcafee.com/corporate/index?page=content&id=SB10348
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.sudo.ws/stable.html#1.9.5p2
https://www.synology.com/security/advisory/Synology_SA_21_02
https://access.redhat.com/security/cve/CVE-2021-3156
http://www.openwall.com/lists/oss-security/2021/01/27/1
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/
https://www.debian.org/security/2021/dsa-4839
http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html
https://security.alpinelinux.org/vuln/CVE-2021-3156
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://lists.debian.org/debian-lts-announce/2021/01/msg00022.html
http://www.openwall.com/lists/oss-security/2021/09/14/2
http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3156
https://www.oracle.com/security-alerts/cpuoct2021.html
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM
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CVSS v4
Base Score:
8.5
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
ATTACKED
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Exploit Maturity
HIGH
CVSS v2
Base Score:
7.2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Weakness Type (CWE)
Off-by-one Error
CWE-193
EPSS
Base Score:
92.48