CVE-2021-3696: Medium severity centos grub2-pc-modules vulnerability
A flaw was found in grub2 when handling a PNG image header. When decoding the data contained in the Huffman table at the PNG file header, an out-of-bounds write may happen on grub's heap.
Other sources
A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Affected Software
Event History
Parent advisories
This vulnerability appears in the following advisories.
Frequently Asked Questions
What is CVE-2021-3696?
CVE-2021-3696 is a vulnerability found in grub2 when handling a PNG image header, which can lead to data corruption in the heap space.
What is the severity of CVE-2021-3696?
The severity of CVE-2021-3696 is medium with a severity value of 5.
What software is affected by CVE-2021-3696?
The affected software includes grub2 versions 1:2.02-123.el8_6.8, 1:2.02-87.el8_1, 1:2.02-87.el8_2, 1:2.02-99.el8_4.9, and 1:2.06-27.el9_0.7.
How can I fix CVE-2021-3696?
You can fix CVE-2021-3696 by applying the recommended patches provided by Redhat.
Where can I find more information about CVE-2021-3696?
You can find more information about CVE-2021-3696 on the CVE website (https://www.cve.org/CVERecord?id=CVE-2021-3696) and NIST NVD (https://nvd.nist.gov/vuln/detail/CVE-2021-3696).