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.
Weakness
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Sudo | Sudo_project | 1.8.2 (including) | 1.8.32 (excluding) |
| Sudo | Sudo_project | 1.9.0 (including) | 1.9.5 (excluding) |
| Sudo | Sudo_project | 1.9.5 (including) | 1.9.5 (including) |
| Sudo | Sudo_project | 1.9.5-patch1 (including) | 1.9.5-patch1 (including) |
| Red Hat Enterprise Linux 6 Extended Lifecycle Support | RedHat | sudo-0:1.8.6p3-29.el6_10.4 | * |
| Red Hat Enterprise Linux 7 | RedHat | sudo-0:1.8.23-10.el7_9.1 | * |
| Red Hat Enterprise Linux 7.2 Advanced Update Support | RedHat | sudo-0:1.8.6p7-17.el7_2.3 | * |
| Red Hat Enterprise Linux 7.3 Advanced Update Support | RedHat | sudo-0:1.8.6p7-23.el7_3.3 | * |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | RedHat | sudo-0:1.8.19p2-12.el7_4.2 | * |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | RedHat | sudo-0:1.8.19p2-12.el7_4.2 | * |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | RedHat | sudo-0:1.8.19p2-12.el7_4.2 | * |
| Red Hat Enterprise Linux 7.6 Extended Update Support | RedHat | sudo-0:1.8.23-3.el7_6.2 | * |
| Red Hat Enterprise Linux 7.7 Extended Update Support | RedHat | sudo-0:1.8.23-4.el7_7.3 | * |
| Red Hat Enterprise Linux 8 | RedHat | sudo-0:1.8.29-6.el8_3.1 | * |
| Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | sudo-0:1.8.25p1-8.el8_1.2 | * |
| Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | sudo-0:1.8.29-5.el8_2.1 | * |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 | RedHat | redhat-virtualization-host-0:4.3.13-20210127.0.el7_9 | * |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | RedHat | redhat-virtualization-host-0:4.4.4-20210201.0.el8_3 | * |
| Sudo | Ubuntu | bionic | * |
| Sudo | Ubuntu | devel | * |
| Sudo | Ubuntu | esm-infra-legacy/trusty | * |
| Sudo | Ubuntu | esm-infra/bionic | * |
| Sudo | Ubuntu | esm-infra/focal | * |
| Sudo | Ubuntu | esm-infra/xenial | * |
| Sudo | Ubuntu | focal | * |
| Sudo | Ubuntu | groovy | * |
| Sudo | Ubuntu | trusty | * |
| Sudo | Ubuntu | trusty/esm | * |
| Sudo | Ubuntu | upstream | * |
| Sudo | Ubuntu | xenial | * |
Potential Mitigations
References
- 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\u0026id=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
- 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
- https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156
- 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\u0026id=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
- 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
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3156