Mageia 2022-0418: wayland security update | LinuxSecurity.com
MGASA-2022-0418 - Updated wayland packages fix security vulnerability

Publication date: 13 Nov 2022
URL: https://advisories.mageia.org/MGASA-2022-0418.html
Type: security
Affected Mageia releases: 8
CVE: CVE-2021-3782

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)

References:
- https://bugs.mageia.org/show_bug.cgi?id=30855
- https://ubuntu.com/security/notices/USN-5614-1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3782

SRPMS:
- 8/core/wayland-1.18.0-3.1.mga8

Mageia 2022-0418: wayland security update

An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool

Summary

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)

References

- https://bugs.mageia.org/show_bug.cgi?id=30855

- https://ubuntu.com/security/notices/USN-5614-1

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3782

Resolution

MGASA-2022-0418 - Updated wayland packages fix security vulnerability

SRPMS

- 8/core/wayland-1.18.0-3.1.mga8

Severity
Publication date: 13 Nov 2022
URL: https://advisories.mageia.org/MGASA-2022-0418.html
Type: security
CVE: CVE-2021-3782

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