CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
AI Score
Confidence
High
EPSS
Percentile
12.8%
Issue Overview:
An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time. (CVE-2021-3782)
Affected Packages:
wayland
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update wayland to update your system.
New Packages:
aarch64:
wayland-devel-1.17.0-1.amzn2.0.1.aarch64
libwayland-client-1.17.0-1.amzn2.0.1.aarch64
libwayland-cursor-1.17.0-1.amzn2.0.1.aarch64
libwayland-egl-1.17.0-1.amzn2.0.1.aarch64
libwayland-server-1.17.0-1.amzn2.0.1.aarch64
wayland-debuginfo-1.17.0-1.amzn2.0.1.aarch64
i686:
wayland-devel-1.17.0-1.amzn2.0.1.i686
libwayland-client-1.17.0-1.amzn2.0.1.i686
libwayland-cursor-1.17.0-1.amzn2.0.1.i686
libwayland-egl-1.17.0-1.amzn2.0.1.i686
libwayland-server-1.17.0-1.amzn2.0.1.i686
wayland-debuginfo-1.17.0-1.amzn2.0.1.i686
noarch:
wayland-doc-1.17.0-1.amzn2.0.1.noarch
src:
wayland-1.17.0-1.amzn2.0.1.src
x86_64:
wayland-devel-1.17.0-1.amzn2.0.1.x86_64
libwayland-client-1.17.0-1.amzn2.0.1.x86_64
libwayland-cursor-1.17.0-1.amzn2.0.1.x86_64
libwayland-egl-1.17.0-1.amzn2.0.1.x86_64
libwayland-server-1.17.0-1.amzn2.0.1.x86_64
wayland-debuginfo-1.17.0-1.amzn2.0.1.x86_64
Red Hat: CVE-2021-3782
Mitre: CVE-2021-3782