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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.2280.2 USN-5259-3: Cron regression 12 May 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cron Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2019-9706 CVE-2019-9705 CVE-2019-9704 CVE-2017-9525 Original Bulletin: https://ubuntu.com/security/notices/USN-5259-3 Comment: CVSS (Max): 6.7 CVE-2017-9525 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) CVSS Source: NVD Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Revision History: May 12 2022: Resend following GPG key renewal May 11 2022: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- USN-5259-3: Cron regression 11 May 2022 USN-5259-1 and USN-5259-2 introduced a regression in Cron. Releases o Ubuntu 18.04 LTS o Ubuntu 16.04 ESM Packages o cron - process scheduling daemon Details USN-5259-1 and USN-5259-2 fixed vulnerabilities in Cron. Unfortunately that update was incomplete and could introduce a regression. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that the postinst maintainer script in Cron unsafely handled file permissions during package install or update operations. An attacker could possibly use this issue to perform a privilege escalation attack. ( CVE-2017-9525 ) Florian Weimer discovered that Cron incorrectly handled certain memory operations during crontab file creation. An attacker could possibly use this issue to cause a denial of service. ( CVE-2019-9704 ) It was discovered that Cron incorrectly handled user input during crontab file creation. An attacker could possibly use this issue to cause a denial of service. ( CVE-2019-9705 ) It was discovered that Cron contained a use-after-free vulnerability in its force_rescan_user function. An attacker could possibly use this issue to cause a denial of service. ( CVE-2019-9706 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 o cron - 3.0pl1-128.1ubuntu1.2 Ubuntu 16.04 o cron - 3.0pl1-128ubuntu2+esm2 Available with UA Infra or UA Desktop In general, a standard system update will make all the necessary changes. References o CVE-2017-9525 o https://ubuntu.com/security/notices/USN-5259-2 o https://launchpad.net/bugs/1971895 Related notices o USN-5259-1 : cron o USN-5259-2 : cron - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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: https://auscert.org.au/gpg-key/ iQIVAwUBYnw6iMkNZI30y1K9AQhxYxAAnTnguePGiA7VOQrcENQTv5jMZwIXamkw vRXwoMe1i4RuM3Iz4d1HpCelOP4F3KlLsO1CgHpSBUmLtl9gHonMxpfgysx2kzt/ CcP9kvDKBsXw3Qis9T6jZLX7AS3RoH7ojF4R4Fpt0oVvvs7Z9A0YgqB/Cibj/eAd s20H/IT0DDwHPwMTMSFYiji4O1RDUvAHF3RFVKsOa8zqjxfjzwZgZ0p7R8QcNdaF RHKID+8FCtN4gEn1dSuvXPMDcuv/3Gdd01aWDvUQi/1gMeh6fvevePe+T47cnpUp XmsgnVA2gJMdLRRoCv43I6AUJednN5bsmixp73CTMJRn8ILrVK38tQJ0BBW1u56Y toEMU9ESZhHIs+i3I5KwEc1TRXirTXpA0Ej6fKADEWWb5n8atmnS0yyaKDD3Gu3s 6Ylubp8F1WDkfJH9slCQfeqELRbhP7a4JcdcUlYDaWqkoHTfZxyES5HoR+zfZqKs AdaBm/Rmh6wZoM9vRChofyrePx/w4DjcvGnDOa6Msje2x1FKlBip6L4wKDuh8uiO Kvh20sdgPsvpdyawhyt8KzQYtg7z2cyfEwJVl7Mrce1JT3ShzXG5fHiHaYylI1v3 t5jkqqx7HCuAepivdel9K3p12mkkSabRh0oRL9n0b2tsavu596qETwIjsFB1sMtG GxYNS2x4GvA= =wt5P -----END PGP SIGNATURE-----