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Mend.io Vulnerability Database

CVE-2021-3156

Good to know:

Date: 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.

Language: C

Severity Score

7.8

Related Resources (41)

Url: http://www.openwall.com/lists/oss-security/2021/02/15/1

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/

Url: https://www.kb.cert.org/vuls/id/794544

Url: http://www.openwall.com/lists/oss-security/2024/01/30/8

Url: https://security-tracker.debian.org/tracker/CVE-2021-3156

Url: http://www.openwall.com/lists/oss-security/2024/01/30/6

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3156

Url: https://www.sudo.ws/stable.html#1.9.5p2

Url: https://www.openwall.com/lists/oss-security/2021/01/26/3

Url: http://packetstormsecurity.com/files/161230/Sudo-Buffer-Overflow-Privilege-Escalation.html

Url: https://www.debian.org/security/2021/dsa-4839

Url: https://www.oracle.com/security-alerts/cpuapr2022.html

Url: http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html

Url: https://lists.debian.org/debian-lts-announce/2021/01/msg00022.html

Url: http://packetstormsecurity.com/files/161270/Sudo-1.9.5p1-Buffer-Overflow-Privilege-Escalation.html

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/

Url: https://www.oracle.com/security-alerts/cpuoct2021.html

Url: http://seclists.org/fulldisclosure/2021/Feb/42

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/

Url: https://support.apple.com/kb/HT212177

Url: https://security.gentoo.org/glsa/202101-33

Url: http://seclists.org/fulldisclosure/2021/Jan/79

Url: http://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html

Url: https://security.netapp.com/advisory/ntap-20210128-0001/

Url: http://www.openwall.com/lists/oss-security/2021/01/27/1

Url: https://security.netapp.com/advisory/ntap-20210128-0002/

Url: https://www.synology.com/security/advisory/Synology_SA_21_02

Url: https://access.redhat.com/security/cve/CVE-2021-3156

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY/

Url: http://seclists.org/fulldisclosure/2024/Feb/3

Url: http://www.openwall.com/lists/oss-security/2021/01/26/3

Url: http://www.openwall.com/lists/oss-security/2021/01/27/2

Url: https://security.alpinelinux.org/vuln/CVE-2021-3156

Url: 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

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

Url: https://www.oracle.com//security-alerts/cpujul2021.html

Url: http://www.openwall.com/lists/oss-security/2021/09/14/2

Url: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sudo-privesc-jan2021-qnYQfcM

Url: https://kc.mcafee.com/corporate/index?page=content&id=SB10348

Url: http://packetstormsecurity.com/files/161293/Sudo-1.8.31p2-1.9.5p1-Buffer-Overflow.html

Url: https://www.mend.io/vulnerability-database/CVE-2021-3156

Severity Score

7.8

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

Off-by-one Error

CWE-193

Top Fix

Upgrade Version

Upgrade to version 1.9.5p2

Learn More

CVSS v3.1

Base Score:	7.8
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

CVSS v2

Base Score:	7.2
Access Vector (AV):	LOCAL
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	COMPLETE
Integrity (I):	COMPLETE
Availability (A):	COMPLETE
Additional information:

Mend.io Vulnerability Database

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CVE-2021-3156

Good to know:

Date: January 26, 2021

Language: C

Severity Score

Related Resources (41)

Severity Score

Weakness Type (CWE)

Top Fix

Upgrade Version

CVSS v3.1

CVSS v2

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