{ "Definition": [ { "ID": "oval:org.altlinux.errata:def:20202731", "Version": "oval:org.altlinux.errata:def:20202731", "Class": "patch", "Metadata": { "Title": "ALT-PU-2020-2731: package `sudo` update to version 1.8.31p2-alt1", "AffectedList": [ { "Family": "unix", "Platforms": [ "ALT Linux branch c9f2" ], "Products": [ "ALT SPWorkstation", "ALT SPServer" ] } ], "References": [ { "RefID": "ALT-PU-2020-2731", "RefURL": "https://errata.altlinux.org/ALT-PU-2020-2731", "Source": "ALTPU" }, { "RefID": "BDU:2020-00855", "RefURL": "https://bdu.fstec.ru/vul/2020-00855", "Source": "BDU" }, { "RefID": "BDU:2020-00856", "RefURL": "https://bdu.fstec.ru/vul/2020-00856", "Source": "BDU" }, { "RefID": "BDU:2020-00857", "RefURL": "https://bdu.fstec.ru/vul/2020-00857", "Source": "BDU" }, { "RefID": "CVE-2019-18634", "RefURL": "https://nvd.nist.gov/vuln/detail/CVE-2019-18634", "Source": "CVE" }, { "RefID": "CVE-2019-18684", "RefURL": "https://nvd.nist.gov/vuln/detail/CVE-2019-18684", "Source": "CVE" }, { "RefID": "CVE-2019-19232", "RefURL": "https://nvd.nist.gov/vuln/detail/CVE-2019-19232", "Source": "CVE" }, { "RefID": "CVE-2019-19234", "RefURL": "https://nvd.nist.gov/vuln/detail/CVE-2019-19234", "Source": "CVE" } ], "Description": "This update upgrades sudo to version 1.8.31p2-alt1. \nSecurity Fix(es):\n\n * BDU:2020-00855: Уязвимость функции stdin getln программы системного администрирования Sudo, позволяющая нарушителю повысить свои привилегии\n\n * BDU:2020-00856: Уязвимость учетной записи sudoer в файле Runas ALL программы системного администрирования Sudo, позволяющая нарушителю отключить аутентификацию пользователя по локальному паролю\n\n * BDU:2020-00857: Уязвимость учетной записи sudoer в файле Runas ALL программы системного администрирования Sudo, позволяющая нарушителю выдать себя за несуществующего пользователя\n\n * CVE-2019-18634: In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.\n\n * CVE-2019-18684: Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write \"ALL ALL=(ALL) NOPASSWD:ALL\" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers\n\n * CVE-2019-19232: In Sudo through 1.8.29, an attacker with access to a Runas ALL sudoer account can impersonate a nonexistent user by invoking sudo with a numeric uid that is not associated with any user. NOTE: The software maintainer believes that this is not a vulnerability because running a command via sudo as a user not present in the local password database is an intentional feature. Because this behavior surprised some users, sudo 1.8.30 introduced an option to enable/disable this behavior with the default being disabled. However, this does not change the fact that sudo was behaving as intended, and as documented, in earlier versions\n\n * CVE-2019-19234: In Sudo through 1.8.29, the fact that a user has been blocked (e.g., by using the ! character in the shadow file instead of a password hash) is not considered, allowing an attacker (who has access to a Runas ALL sudoer account) to impersonate any blocked user. NOTE: The software maintainer believes that this CVE is not valid. Disabling local password authentication for a user is not the same as disabling all access to that user--the user may still be able to login via other means (ssh key, kerberos, etc). Both the Linux shadow(5) and passwd(1) manuals are clear on this. Indeed it is a valid use case to have local accounts that are _only_ accessible via sudo and that cannot be logged into with a password. Sudo 1.8.30 added an optional setting to check the _shell_ of the target user (not the encrypted password!) against the contents of /etc/shells but that is not the same thing as preventing access to users with an invalid password hash", "Advisory": { "From": "errata.altlinux.org", "Severity": "High", "Rights": "Copyright 2024 BaseALT Ltd.", "Issued": { "Date": "2020-09-04" }, "Updated": { "Date": "2020-09-04" }, "BDUs": [ { "ID": "BDU:2020-00855", "CVSS": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "CVSS3": "AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "CWE": "CWE-787", "Href": "https://bdu.fstec.ru/vul/2020-00855", "Impact": "High", "Public": "20200129" }, { "ID": "BDU:2020-00856", "CVSS": "AV:N/AC:L/Au:N/C:N/I:C/A:N", "CVSS3": "AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "CWE": "CWE-284", "Href": "https://bdu.fstec.ru/vul/2020-00856", "Impact": "High", "Public": "20191219" }, { "ID": "BDU:2020-00857", "CVSS": "AV:N/AC:L/Au:N/C:N/I:C/A:N", "CVSS3": "AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "CWE": "CWE-284", "Href": "https://bdu.fstec.ru/vul/2020-00857", "Impact": "High", "Public": "20191219" } ], "CVEs": [ { "ID": "CVE-2019-18634", "CVSS": "AV:L/AC:L/Au:N/C:P/I:P/A:P", "CVSS3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "CWE": "CWE-787", "Href": "https://nvd.nist.gov/vuln/detail/CVE-2019-18634", "Impact": "High", "Public": "20200129" }, { "ID": "CVE-2019-18684", "CVSS": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "CVSS3": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "CWE": "CWE-362", "Href": "https://nvd.nist.gov/vuln/detail/CVE-2019-18684", "Impact": "High", "Public": "20191104" }, { "ID": "CVE-2019-19232", "CVSS": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "CVSS3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "CWE": "NVD-CWE-noinfo", "Href": "https://nvd.nist.gov/vuln/detail/CVE-2019-19232", "Impact": "High", "Public": "20191219" }, { "ID": "CVE-2019-19234", "CVSS": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "CVSS3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "CWE": "NVD-CWE-noinfo", "Href": "https://nvd.nist.gov/vuln/detail/CVE-2019-19234", "Impact": "High", "Public": "20191219" } ], "AffectedCPEs": { "CPEs": [ "cpe:/o:alt:spworkstation:8.4", "cpe:/o:alt:spserver:8.4" ] } } }, "Criteria": { "Operator": "AND", "Criterions": [ { "TestRef": "oval:org.altlinux.errata:tst:4001", "Comment": "ALT Linux must be installed" } ], "Criterias": [ { "Operator": "OR", "Criterions": [ { "TestRef": "oval:org.altlinux.errata:tst:20202731001", "Comment": "sudo is earlier than 1:1.8.31p2-alt1" }, { "TestRef": "oval:org.altlinux.errata:tst:20202731002", "Comment": "sudo-devel is earlier than 1:1.8.31p2-alt1" } ] } ] } } ] }