QID 355541

Date Published: 2023-07-03

QID 355541: Amazon Linux Security Advisory for wayland : ALAS2-2023-2103

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)

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

CVSS V3 rated as High - 6.6 severity.

CVSS V2 rated as Medium - 5.4 severity.

Solution

Please refer to Amazon advisory: ALAS2-2023-2103 for affected packages and patching details, or update with your package manager.

Vendor References

ALAS2-2023-2103 - alas.aws.amazon.com/AL2/ALAS-2023-2103.html

CVEs related to QID 355541

CVE-2021-3782 |

Software Advisories

Advisory ID	Software	Component	Link
ALAS2-2023-2103	amazon linux 2		alas.aws.amazon.com/AL2/ALAS-2023-2103.html

By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].