Detections
Analytics
Azure Linux 3.0 Security Update: kata-containers / kata-containers-cc / rust / virtiofsd (CVE-2024-43806)
medium Nessus Plugin ID 216051
Synopsis
The remote Azure Linux host is missing one or more security updates.Description
The version of kata-containers / kata-containers-cc / rust / virtiofsd installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2024-43806 advisory.- Rustix is a set of safe Rust bindings to POSIX-ish APIs. When using `rustix::fs::Dir` using the `linux_raw` backend, it's possible for the iterator to get stuck when an IO error is encountered.
Combined with a memory over-allocation issue in `rustix::fs::Dir::read_more`, this can cause quick and unbounded memory explosion (gigabytes in a few seconds if used on a hot path) and eventually lead to an OOM crash of the application. The symptoms were initially discovered in https://github.com/imsnif/bandwhich/issues/284. That post has lots of details of our investigation. Full details can be read on the GHSA-c827-hfw6-qwvm repo advisory. If a program tries to access a directory with its file descriptor after the file has been unlinked (or any other action that leaves the `Dir` iterator in the stuck state), and the implementation does not break after seeing an error, it can cause a memory explosion. As an example, Linux's various virtual file systems (e.g. `/proc`, `/sys`) can contain directories that spontaneously pop in and out of existence. Attempting to iterate over them using `rustix::fs::Dir` directly or indirectly (e.g. with the `procfs` crate) can trigger this fault condition if the implementation decides to continue on errors. An attacker knowledgeable about the implementation details of a vulnerable target can therefore try to trigger this fault condition via any one or a combination of several available APIs. If successful, the application host will quickly run out of memory, after which the application will likely be terminated by an OOM killer, leading to denial of service. This issue has been addressed in release versions 0.35.15, 0.36.16, 0.37.25, and 0.38.19. Users are advised to upgrade. There are no known workarounds for this issue. (CVE-2024-43806)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
Plugin Details
Severity: Medium
ID: 216051
File Name: azure_linux_CVE-2024-43806.nasl
Version: 1.2
Type: local
Published: 2/11/2025
Updated: 3/28/2025
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C
CVSS Score Source: CVE-2024-43806
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.7
Vector: CVSS:3.0/AV:N/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:microsoft:azure_linux:kata-containers, p-cpe:/a:microsoft:azure_linux:kata-containers-cc, p-cpe:/a:microsoft:azure_linux:rust, x-cpe:/o:microsoft:azure_linux, p-cpe:/a:microsoft:azure_linux:virtiofsd, p-cpe:/a:microsoft:azure_linux:kata-containers-tools, p-cpe:/a:microsoft:azure_linux:rust-doc, p-cpe:/a:microsoft:azure_linux:kata-containers-cc-tools
Required KB Items: Host/local_checks_enabled, Host/AzureLinux/release, Host/AzureLinux/rpm-list, Host/cpu
Exploit Ease: No known exploits are available
Patch Publication Date: 2/6/2025
Vulnerability Publication Date: 8/26/2024
Reference Information
CVE: CVE-2024-43806