CVE-2021-3697
First published: Mon Aug 09 2021(Updated: )
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/grub2 | 2.06-3~deb10u1 2.06-3~deb10u3 2.06-3~deb11u5 2.06-3~deb11u4 2.06-13 2.12~rc1-9 | |
| redhat/grub2 | <1:2.02-123.el8_6.8 | 1:2.02-123.el8_6.8 |
| redhat/grub2 | <1:2.02-87.el8_1.10 | 1:2.02-87.el8_1.10 |
| redhat/grub2 | <1:2.02-87.el8_2.10 | 1:2.02-87.el8_2.10 |
| redhat/grub2 | <1:2.02-99.el8_4.9 | 1:2.02-99.el8_4.9 |
| redhat/grub2 | <1:2.06-27.el9_0.7 | 1:2.06-27.el9_0.7 |
| redhat/grub | <2.12 | 2.12 |
| Gnu Grub2 | >=2.00<2.12 | |
| Redhat Developer Tools | =1.0 | |
| Redhat Openshift | =3.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =8.1 | |
| Redhat Enterprise Linux | =8.4 | |
| Redhat Enterprise Linux | =9.0 | |
| Redhat Enterprise Linux Eus | =8.2 | |
| Redhat Enterprise Linux Eus | =8.4 | |
| Redhat Enterprise Linux Eus | =8.6 | |
| Redhat Enterprise Linux Eus | =9.0 | |
| Redhat Enterprise Linux For Power Little Endian | =8.0 | |
| Redhat Enterprise Linux For Power Little Endian | =9.0 | |
| Redhat Enterprise Linux For Power Little Endian Eus | =8.2 | |
| Redhat Enterprise Linux For Power Little Endian Eus | =8.4 | |
| Redhat Enterprise Linux For Power Little Endian Eus | =8.6 | |
| Redhat Enterprise Linux For Power Little Endian Eus | =9.0 | |
| Redhat Enterprise Linux Server Aus | =8.2 | |
| Redhat Enterprise Linux Server Aus | =8.4 | |
| Redhat Enterprise Linux Server Aus | =8.6 | |
| Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | =8.1 | |
| Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | =8.2 | |
| Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | =8.4 | |
| Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | =8.6 | |
| Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions | =9.0 | |
| Redhat Enterprise Linux Server Tus | =8.2 | |
| Redhat Enterprise Linux Server Tus | =8.4 | |
| Redhat Enterprise Linux Server Tus | =8.6 | |
| Redhat Openshift Container Platform | =4.6 | |
| Redhat Openshift Container Platform | =4.9 | |
| Redhat Openshift Container Platform | =4.10 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Codeready Linux Builder | ||
| Redhat Enterprise Linux | =9.0 | |
| Redhat Enterprise Linux Eus | =8.2 | |
| Redhat Enterprise Linux Eus | =8.4 | |
| Redhat Enterprise Linux Eus | =8.6 | |
| Redhat Enterprise Linux Eus | =9.0 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1991687
- https://security.gentoo.org/glsa/202209-12
- https://security.netapp.com/advisory/ntap-20220930-0001/
- https://launchpad.net/bugs/cve/CVE-2021-3697
- https://access.redhat.com/errata/RHSA-2022:5098
- https://access.redhat.com/errata/RHSA-2022:5096
- https://access.redhat.com/errata/RHSA-2022:5099
- https://access.redhat.com/errata/RHSA-2022:5095
- https://access.redhat.com/errata/RHSA-2022:5100
- https://access.redhat.com/security/cve/cve-2021-3697
- https://www.cve.org/CVERecord?id=CVE-2021-3697 https://nvd.nist.gov/vuln/detail/CVE-2021-3697
- https://www.openwall.com/lists/oss-security/2022/06/07/5
- https://security-tracker.debian.org/tracker/CVE-2021-3697
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3697
- https://nvd.nist.gov/vuln/detail/CVE-2021-3697
- https://ubuntu.com/security/CVE-2021-3697
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2021-3697?
CVE-2021-3697 is a vulnerability in grub2 that allows an attacker to craft a malicious JPEG image, leading to a heap underflow and potential remote code execution.
How can an attacker exploit CVE-2021-3697?
An attacker can exploit CVE-2021-3697 by creating a specially crafted JPEG image that triggers a heap underflow when processed by the grub2 JPEG reader, allowing them to execute arbitrary code.
Which software versions are affected by CVE-2021-3697?
CVE-2021-3697 affects grub2 versions up to, but not including, 2.12.
How can I fix CVE-2021-3697?
To fix CVE-2021-3697, you should update your grub2 package to version 2.12 or later, as provided by the respective vendor's patch or security advisory.
What is the severity of CVE-2021-3697?
CVE-2021-3697 has a severity rating of high, with a CVSSv3 base score of 7.0.
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