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Ubuntu 20.04 LTS / 22.04 LTS : Linux kernel vulnerabilities (USN-6775-1)

medium Nessus Plugin ID 197214

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6775-1 advisory.

 - The brcm80211 component in the Linux kernel through 6.5.10 has a brcmf_cfg80211_detach use-after-free in the device unplugging (disconnect the USB by hotplug) code. For physically proximate attackers with local access, this could be exploited in a real world scenario. This is related to brcmf_cfg80211_escan_timeout_worker in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c.
 (CVE-2023-47233)

 - In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix potential key use- after-free When ieee80211_key_link() is called by ieee80211_gtk_rekey_add() but returns 0 due to KRACK protection (identical key reinstall), ieee80211_gtk_rekey_add() will still return a pointer into the key, in a potential use-after-free. This normally doesn't happen since it's only called by iwlwifi in case of WoWLAN rekey offload which has its own KRACK protection, but still better to fix, do that by returning an error code and converting that to success on the cfg80211 boundary only, leaving the error for bad callers of ieee80211_gtk_rekey_add(). (CVE-2023-52530)

 - In the Linux kernel, the following vulnerability has been resolved: tomoyo: fix UAF write bug in tomoyo_write_control() Since tomoyo_write_control() updates head->write_buf when write() of long lines is requested, we need to fetch head->write_buf after head->io_sem is held. Otherwise, concurrent write() requests can cause use-after-free-write and double-free problems. (CVE-2024-26622)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

https://ubuntu.com/security/notices/USN-6775-1

Plugin Details

Severity: Medium

ID: 197214

File Name: ubuntu_USN-6775-1.nasl

Version: 1.0

Type: local

Agent: unix

Published: 5/16/2024

Updated: 5/16/2024

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2023-47233

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-107-generic-lpae, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1057-intel-iotg, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1045-gkeop, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1059-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1055-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-107-generic, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-107-lowlatency-64k, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1064-azure-fde, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1060-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-107-generic-64k, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1055-ibm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-107-lowlatency

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/16/2024

Vulnerability Publication Date: 11/3/2023

Reference Information

CVE: CVE-2023-47233, CVE-2023-52530, CVE-2024-26622

USN: 6775-1