Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character:

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-3156
• 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@lists.fedoraproject.org/message/CALA5FTXIQBRRYUA2ZQNJXB6OQMAXEII/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.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
• https://www.debian.org/security/2021/dsa-4839
• https://www.kb.cert.org/vuls/id/794544
• https://www.openwall.com/lists/oss-security/2021/01/26/3
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpuoct2021.html
• https://www.sudo.ws/stable.html#1.9.5p2
• https://www.synology.com/security/advisory/Synology_SA_21_02
• 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://seclists.org/fulldisclosure/2021/Feb/42
• http://seclists.org/fulldisclosure/2021/Jan/79
• 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
• 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/
• http://www.openwall.com/lists/oss-security/2024/01/30/6
• http://www.openwall.com/lists/oss-security/2024/01/30/8
• http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
• http://seclists.org/fulldisclosure/2024/Feb/3