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A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

CVE-2023-5367 is an out-of-bounds write vulnerability identified in the xorg-x11-server component of Red Hat Enterprise Linux 6 Extended Lifecycle Support. The flaw is due to incorrect calculation of buffer offsets when copying heap-stored data within the XIChangeDeviceProperty function in Xi/xiproperty.c and the RRChangeOutputProperty function in randr/rrproperty.c. These functions handle changes to device and output properties in the X server, a critical component managing graphical display and input devices. The incorrect offset calculation can lead to writing outside the allocated buffer boundaries, potentially corrupting memory. This memory corruption can be exploited by a local attacker with low privileges to escalate their privileges or cause a denial of service by crashing the X server. The vulnerability has a CVSS 3.1 score of 7.8, indicating high severity, with an attack vector limited to local access (AV:L), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), and impacts on confidentiality, integrity, and availability all rated high (C:H/I:H/A:H). No known public exploits have been reported yet, but the vulnerability poses a significant risk in environments where attackers can gain local access, such as multi-user systems or systems exposed to untrusted users. The affected product is Red Hat Enterprise Linux 6 Extended Lifecycle Support, which is an older but still supported version for certain customers requiring extended maintenance. The lack of patch links suggests that fixes may be pending or available through Red Hat’s extended support channels.

Detailed information about CVE-2023-5367: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION affecting Red Hat Re

CVE-2023-5367: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-5367: Out-of-bounds Write in Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION

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