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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0287 USN-4705-1: Sudo vulnerabilities 27 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Sudo Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Root Compromise -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-23239 CVE-2021-3156 Reference: ESB-2021.0281 Original Bulletin: https://ubuntu.com/security/notices/USN-4705-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4705-1: Sudo vulnerabilities 26 January 2021 Several security issues were fixed in Sudo. Releases o Ubuntu 20.10 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Packages o sudo - Provide limited super user privileges to specific users Details It was discovered that Sudo incorrectly handled memory when parsing command lines. A local attacker could possibly use this issue to obtain unintended access to the administrator account. ( CVE-2021-3156 ) It was discovered that the Sudo sudoedit utility incorrectly handled checking directory permissions. A local attacker could possibly use this issue to bypass file permissions and determine if a directory exists or not. ( CVE-2021-23239 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10 o sudo - 1.9.1-1ubuntu1.1 o sudo-ldap - 1.9.1-1ubuntu1.1 Ubuntu 20.04 o sudo - 1.8.31-1ubuntu1.2 o sudo-ldap - 1.8.31-1ubuntu1.2 Ubuntu 18.04 o sudo - 1.8.21p2-3ubuntu1.4 o sudo-ldap - 1.8.21p2-3ubuntu1.4 Ubuntu 16.04 o sudo - 1.8.16-0ubuntu1.10 o sudo-ldap - 1.8.16-0ubuntu1.10 In general, a standard system update will make all the necessary changes. References o CVE-2021-3156 o CVE-2021-23239 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYBC38ONLKJtyKPYoAQhBjQ/+LeCU6osIZXVfAqQx0eq+iHtW+lC6odj/ YC3rKf7mEWgE/EqcvoRq/ME2WDDEqGewaPzwGdyMYE4aR8CCFLbDbFfYGKadavKW oLdlfx2SvZOq0sKYDZhoVas9wLFU0pW8/08tg2VA5w6ooel10sS6h2EY3nG0ubw4 D0AhnTKbb9fQavw5PDwymw9DySCI9adx7doUyfhSZXph81VfekM5fN8w048CRjVM JJzejbClO41Tavo5OOpg6a8SwQhDLgHGahqJaQflygql7NsuRagyLod1p7e/Qt5G y1jrmaG9f6lCx1cQraZUDtgX0iMJbHxWMHPmAYRM43r9qsizBFuuabNRByDTjFMX 42FSjlGr2pSvD9OU4nJ+816d+IiThKarqeaq7Qgb+ydhzKz8FhjAzlgahkl6rIfi S8hImzWhFWOyzMdVxnb0CmBjFC0RLJX/Bld55KZacwWtzQ/UeJQbEPCy928ZnKiY QXj060EhyVbLHOp6dPnSUM7u3YgZmto/LTarrIbCdmnSIbraUtxpwzIzeAE8oRy9 ymJ8mcTCFOls6pfLotFFna+iZnzqWc9GrEYyDRVnAgTbaY+1nW4F/BC1TcU2OfaP IRnkilzDShkPT5CmNqWeWihexUbdsoTj6Diu+19b5fzTEyT4UIjPEBBakZhQ9LmG 4Z/Qk/9KEoI= =Y3D7 -----END PGP SIGNATURE-----