Medium: wayland

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  

Additional References

Red Hat: CVE-2021-3782

Mitre: CVE-2021-3782