A heap-based buffer over-read vulnerability was found in the X.org servers ProcXIGetSelectedEvents() function. This issue occurs when byte-swapped length values are used in replies, potentially leading to memory leakage and segmentation faults, particularly when triggered by a client with a different endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory values and then transmit them back to the client until encountering an unmapped page, resulting in a crash. Despite the attackers inability to control the specific memory copied into the replies, the small length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds reads.
The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | RedHat | xorg-x11-server-0:1.20.4-29.el7_9 | * |
| Red Hat Enterprise Linux 7 | RedHat | tigervnc-0:1.8.0-33.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.13.1-2.el8_9.10 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-0:1.20.11-23.el8_10 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.13.1-10.el8_10 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-Xwayland-0:21.1.3-16.el8_10 | * |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | RedHat | tigervnc-0:1.9.0-15.el8_2.11 | * |
| Red Hat Enterprise Linux 8.2 Telecommunications Update Service | RedHat | tigervnc-0:1.9.0-15.el8_2.11 | * |
| Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | RedHat | tigervnc-0:1.9.0-15.el8_2.11 | * |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | RedHat | tigervnc-0:1.11.0-8.el8_4.10 | * |
| Red Hat Enterprise Linux 8.4 Telecommunications Update Service | RedHat | tigervnc-0:1.11.0-8.el8_4.10 | * |
| Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | RedHat | tigervnc-0:1.11.0-8.el8_4.10 | * |
| Red Hat Enterprise Linux 8.6 Extended Update Support | RedHat | tigervnc-0:1.12.0-6.el8_6.11 | * |
| Red Hat Enterprise Linux 8.8 Extended Update Support | RedHat | tigervnc-0:1.12.0-15.el8_8.10 | * |
| Red Hat Enterprise Linux 9 | RedHat | tigervnc-0:1.13.1-8.el9_4.3 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-Xwayland-0:23.2.7-1.el9 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-0:1.20.11-26.el9 | * |
| Red Hat Enterprise Linux 9.0 Extended Update Support | RedHat | tigervnc-0:1.11.0-22.el9_0.11 | * |
| Red Hat Enterprise Linux 9.2 Extended Update Support | RedHat | tigervnc-0:1.12.0-14.el9_2.8 | * |
| Xorg-server | Ubuntu | devel | * |
| Xorg-server | Ubuntu | esm-infra/bionic | * |
| Xorg-server | Ubuntu | esm-infra/xenial | * |
| Xorg-server | Ubuntu | focal | * |
| Xorg-server | Ubuntu | jammy | * |
| Xorg-server | Ubuntu | mantic | * |
| Xorg-server | Ubuntu | noble | * |
| Xorg-server | Ubuntu | oracular | * |
| Xorg-server | Ubuntu | trusty/esm | * |
| Xwayland | Ubuntu | jammy | * |
| Xwayland | Ubuntu | mantic | * |