安全公告/【CVE-2021-3695】

基本信息

漏洞描述

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.

修复方式

sudo apt update && sudo apt dist-upgrade

漏洞判定

执行命令apt policy PackageName获取软件包版本号，版本小于修复版本，则受此漏洞影响，版本大于等于修复版本，则此漏洞已修复

参考

https://security-tracker.debian.org/tracker/CVE-2021-3695
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3695
https://nvd.nist.gov/vuln/detail/CVE-2021-3695