Mike Stroyan discovered that cloud-init could log password hashes when reporting schema failures. An attacker with access to these logs could potentially use this to gain user credentials.

It was discovered that libvirt incorrectly handled certain locking operations. A local attacker could possibly use this issue to cause libvirt to stop accepting connections, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-3667) It was discovered that libvirt incorrectly handled threads during shutdown. A local attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-3975) It was discovered that libvirt incorrectly handled the libxl driver. An attacker inside a guest could possibly use this issue to cause libvirtd to crash or stop responding, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 21.10. (CVE-2021-4147) It was discovered that libvirt incorrectly handled the nwfilter driver. A local attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. (CVE-2022-0897) It was discovered that libvirt incorrectly handled the polkit access control driver. A local attacker could possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-25637) It was discovered that libvirt incorrectly generated SELinux labels. In environments using SELinux, this issue could allow the sVirt confinement to be bypassed. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-3631)

It was discovered that Mutt incorrectly handled certain requests. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-32055) It was discovered that Mutt incorrectly handled certain input. An attacker could possibly use this issue to cause a crash, or expose sensitive information. (CVE-2022-1328)

It was discovered that OpenVPN incorrectly handled certain configurations with multiple authentication plugins. A remote attacker could possibly use this issue to bypass authentication using incomplete credentials.

USN-5300-1 fixed vulnerabilities in PHP. This update provides the corresponding updates for Ubuntu 21.10. Original advisory details: It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. (CVE-2015-9253, CVE-2017-8923, CVE-2017-9118, CVE-2017-9120) It was discovered that PHP incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service, or possibly obtain sensitive information. (CVE-2017-9119) It was discovered that PHP incorrectly handled certain scripts with XML parsing functions. An attacker could possibly use this issue to obtain sensitive information. (CVE-2021-21707)

It was discovered that Open vSwitch incorrectly handled certain fragmented packets. A remote attacker could possibly use this issue to cause Open vSwitch to consume resources, leading to a denial of service.

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.

It was discovered that BusyBox incorrectly handled certain malformed gzip archives. If a user or automated system were tricked into processing a specially crafted gzip archive, a remote attacker could use this issue to cause BusyBox to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-28831) It was discovered that BusyBox incorrectly handled certain malformed LZMA archives. If a user or automated system were tricked into processing a specially crafted LZMA archive, a remote attacker could use this issue to cause BusyBox to crash, resulting in a denial of service, or possibly leak sensitive information. (CVE-2021-42374) Vera Mens, Uri Katz, Tal Keren, Sharon Brizinov, and Shachar Menashe discovered that BusyBox incorrectly handled certain awk patterns. If a user or automated system were tricked into processing a specially crafted awk pattern, a remote attacker could use this issue to cause BusyBox to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-42378, CVE-2021-42379, CVE-2021-42380, CVE-2021-42381, CVE-2021-42382, CVE-2021-42384, CVE-2021-42385, CVE-2021-42386)

It was discovered that Vim incorrectly handled permissions on the .swp file. A local attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 14.04 ESM. (CVE-2017-17087) It was discovered that Vim incorrectly handled restricted mode. A local attacker could possibly use this issue to bypass restricted mode and execute arbitrary commands. Note: This update only makes executing shell commands more difficult. Restricted mode should not be considered a complete security measure. This issue only affected Ubuntu 14.04 ESM. (CVE-2019-20807) Brian Carpenter discovered that vim incorrectly handled memory when opening certain files. If a user was tricked into opening a specially crafted file, a remote attacker could crash the application, leading to a denial of service, or possible execute arbitrary code with user privileges. This issue only affected Ubuntu 20.04 LTS, Ubuntu 21.04 and Ubuntu 21.10. (CVE-2021-3872) It was discovered that vim incorrectly handled memory when opening certain files. If a user was tricked into opening a specially crafted file, a remote attacker could crash the application, leading to a denial of service, or possible execute arbitrary code with user privileges. (CVE-2021-3903) It was discovered that vim incorrectly handled memory when opening certain files. If a user was tricked into opening a specially crafted file, a remote attacker could crash the application, leading to a denial of service, or possible execute arbitrary code with user privileges. (CVE-2021-3927) It was discovered that vim incorrectly handled memory when opening certain files. If a user was tricked into opening a specially crafted file, a remote attacker could crash the application, leading to a denial of service, or possible execute arbitrary code with user privileges. (CVE-2021-3928)

Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. (CVE-2016-2124) Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. (CVE-2020-25717) Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos tickets issues by an RODC. An RODC could print administrator tickets, contrary to expectations. (CVE-2020-25718) Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets. Delegated administrators could possibly use this issue to impersonate accounts, leading to total domain compromise. (CVE-2020-25719) Andrew Bartlett discovered that Samba did not provide stable AD identifiers to Kerberos acceptors. (CVE-2020-25721) Andrew Bartlett discovered that Samba did not properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722) Stefan Metzmacher discovered that Samba incorrectly handled certain large DCE/RPC requests. A remote attacker could possibly use this issue to bypass signature requirements. (CVE-2021-23192) William Ross discovered that Samba incorrectly handled memory. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly escalate privileges. (CVE-2021-3738) Joseph Sutton discovered that Samba incorrectly handled certain TGS requests. An authenticated attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2021-3671) The fix for CVE-2020-25717 results in possible behaviour changes that could affect certain environments. Please see the upstream advisory for more information: https://www.samba.org/samba/security/CVE-2020-25717.html