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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2021-3156

CVE-2021-3156

HIGH7.8

Sudo before 1

Published Jan 26, 2021

Modified 4 months ago

Details

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(36)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

CVSS Analysis

CVSS v3.1

7.8

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

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

Ecosystems

Timeline

PublishedJan 26, 2021

ModifiedOct 21, 2025

CVE-2021-3156 | Mondoo Vulnerability Intelligence