Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Grub2 | >= 2.00, < 2.12 |
| Fedoraproject | Fedora | 36 |
| Redhat | Developer Tools | 1.0 |
| Redhat | Openshift | 3.0 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux Eus | 8.2 |
| Redhat | Enterprise Linux For Power Little Endian | 8.0 |
| Redhat | Enterprise Linux For Power Little Endian Eus | 8.2 |
| Redhat | Enterprise Linux Server Aus | 8.2 |
| Redhat | Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | 8.1 |
| Redhat | Enterprise Linux Server Tus | 8.2 |
| Redhat | Openshift Container Platform | 4.6 |
| Redhat | Codeready Linux Builder | - |
| Netapp | Ontap Select Deploy Administration Utility | - |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1991685Issue TrackingThird Party Advisory
- https://security.gentoo.org/glsa/202209-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220930-0001/Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1991685Issue TrackingThird Party Advisory
- https://security.gentoo.org/glsa/202209-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220930-0001/Third Party Advisory
FAQ
What is CVE-2021-3695?
CVE-2021-3695 is a vulnerability with a CVSS score of 4.5 (MEDIUM). 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...
How severe is CVE-2021-3695?
CVE-2021-3695 has been rated MEDIUM with a CVSS base score of 4.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3695?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Grub2, Fedoraproject Fedora, Redhat Developer Tools, Redhat Openshift, Redhat Enterprise Linux.