Detections
Analytics
AlmaLinux 9 : tigervnc (ALSA-2024:0557)
critical Nessus Plugin ID 189841
Synopsis
The remote AlmaLinux host is missing one or more security updates.Description
The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2024:0557 advisory.- A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used. (CVE-2023-6816)
- The X.Org project reports: Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255 but the X.Org Server was only allocating space for the device's number of buttons, leading to a heap overflow if a bigger value was used. If a device has both a button class and a key class and numButtons is zero, we can get an out-of-bounds write due to event under- allocation in the DeliverStateNotifyEvent function. The XISendDeviceHierarchyEvent() function allocates space to store up to MAXDEVICES (256) xXIHierarchyInfo structures in info.
If a device with a given ID was removed and a new device with the same ID added both in the same operation, the single device ID will lead to two info structures being written to info. Since this case can occur for every device ID at once, a total of two times MAXDEVICES info structures might be written to the allocation, leading to a heap buffer overflow. The DisableDevice() function is called whenever an enabled device is disabled and it moves the device from the inputInfo.devices linked list to the inputInfo.off_devices linked list. However, its link/unlink operation has an issue during the recursive call to DisableDevice() due to the prev pointer pointing to a removed device. This issue leads to a length mismatch between the total number of devices and the number of device in the list, leading to a heap overflow and, possibly, to local privilege escalation.
(CVE-2024-0229, CVE-2024-21885, CVE-2024-21886)
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 packages.See Also
Plugin Details
Severity: Critical
ID: 189841
File Name: alma_linux_ALSA-2024-0557.nasl
Version: 1.0
Type: local
Family: Alma Linux Local Security Checks
Published: 1/31/2024
Updated: 1/31/2024
Supported Sensors: Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.4
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2023-6816
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:alma:linux:tigervnc-icons, p-cpe:/a:alma:linux:tigervnc-license, cpe:/o:alma:linux:9::highavailability, p-cpe:/a:alma:linux:tigervnc-selinux, p-cpe:/a:alma:linux:tigervnc-server, p-cpe:/a:alma:linux:tigervnc-server-module, cpe:/o:alma:linux:9::appstream, cpe:/o:alma:linux:9::nfv, cpe:/o:alma:linux:9::realtime, cpe:/o:alma:linux:9, cpe:/o:alma:linux:9::resilientstorage, cpe:/o:alma:linux:9::sap_hana, cpe:/o:alma:linux:9::supplementary, cpe:/o:alma:linux:9::sap, cpe:/o:alma:linux:9::crb, p-cpe:/a:alma:linux:tigervnc-server-minimal, p-cpe:/a:alma:linux:tigervnc, cpe:/o:alma:linux:9::baseos
Required KB Items: Host/local_checks_enabled, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/cpu
Exploit Ease: No known exploits are available
Patch Publication Date: 1/30/2024
Vulnerability Publication Date: 1/16/2024
Reference Information
CVE: CVE-2023-6816, CVE-2024-0229, CVE-2024-21885, CVE-2024-21886