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USN-5000-1: Linux kernel vulnerabilities | Cloud Foundry

Description

## Severity High ## Vendor Canonical Ubuntu ## Versions Affected * Canonical Ubuntu 18.04 ## Description Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609) Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141) Mathy Vanhoef discovered that the in the Linux kernel’s WiFi implementation leading to accepting plaintext fragments. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145) Mathy Vanhoef discovered that the the Linux kernel’s WiFi implementation leading to reassembling mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147) Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133) Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23134) Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829) It was discovered that a race condition in the kernel Bluetooth subsystem can lead to use-after-free of slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399) It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33034) It was discovered that an out-of-bounds (OOB) memory access flaw in the f2fs module of the Linux kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506) CVEs contained in this USN include: CVE-2021-31829, CVE-2021-33200, CVE-2021-23134, CVE-2021-3506, CVE-2020-24586, CVE-2020-24587, CVE-2021-32399, CVE-2020-24588, CVE-2020-26141, CVE-2021-33034, CVE-2020-26145, CVE-2020-26147, CVE-2021-3609, CVE-2020-26139, CVE-2021-23133. ## Affected Cloud Foundry Products and Versions _Severity is high unless otherwise noted._ * Bionic Stemcells * 1.x versions prior to 1.13 * All other stemcells not listed. ## Mitigation Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases: * Bionic Stemcells * Upgrade 1.x versions to 1.13 or greater * All other stemcells should be upgraded to the latest version available on [bosh.io](<https://bosh.io/stemcells>). ## References * [USN Notice](<https://usn.ubuntu.com/5000-1/>) * [CVE-2021-31829](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-31829>) * [CVE-2021-33200](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33200>) * [CVE-2021-23134](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23134>) * [CVE-2021-3506](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3506>) * [CVE-2020-24586](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24586>) * [CVE-2020-24587](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24587>) * [CVE-2021-32399](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-32399>) * [CVE-2020-24588](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-24588>) * [CVE-2020-26141](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26141>) * [CVE-2021-33034](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-33034>) * [CVE-2020-26145](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26145>) * [CVE-2020-26147](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26147>) * [CVE-2021-3609](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3609>) * [CVE-2020-26139](<https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26139>) * [CVE-2021-23133](<https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23133>) ## History 2021-07-08: Initial vulnerability report published.


Affected Software


CPE Name Name Version
bionic stemcells 1.13

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