medium
6
CWE
119 122 190
Advisory Published
CVE Published
CVE Published
Updated

CVE-2020-14311: Buffer Overflow

First published: Mon Jun 29 2020(Updated: )

A flaw was found in grub2 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow, leading to a zero-sized memory allocation with a subsequent heap-based buffer overflow. The highest threat from this vulnerability is to integrity and system availability.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/fwupdate<0:12-6.el7_8
0:12-6.el7_8
redhat/grub2<1:2.02-0.86.el7_8
1:2.02-0.86.el7_8
redhat/shim<0:15-7.el7_9
0:15-7.el7_9
redhat/shim-signed<0:15-7.el7_8
0:15-7.el7_8
redhat/grub2<1:2.02-0.86.el7_2
1:2.02-0.86.el7_2
redhat/shim<0:15-8.el7
0:15-8.el7
redhat/shim-signed<0:15-8.el7_2
0:15-8.el7_2
redhat/grub2<1:2.02-0.86.el7
1:2.02-0.86.el7
redhat/shim-signed<0:15-8.el7_3
0:15-8.el7_3
redhat/fwupdate<0:9-10.el7_4
0:9-10.el7_4
redhat/grub2<1:2.02-0.86.el7_4
1:2.02-0.86.el7_4
redhat/shim-signed<0:15-8.el7_4
0:15-8.el7_4
redhat/fwupdate<0:12-6.el7_6
0:12-6.el7_6
redhat/grub2<1:2.02-0.86.el7_6
1:2.02-0.86.el7_6
redhat/shim-signed<0:15-8.el7_6
0:15-8.el7_6
redhat/fwupdate<0:12-6.el7_7
0:12-6.el7_7
redhat/grub2<1:2.02-0.86.el7_7
1:2.02-0.86.el7_7
redhat/shim-signed<0:15-8.el7_7
0:15-8.el7_7
redhat/fwupd<0:1.1.4-7.el8_2
0:1.1.4-7.el8_2
redhat/grub2<1:2.02-87.el8_2
1:2.02-87.el8_2
redhat/shim<0:15-14.el8_2
0:15-14.el8_2
redhat/shim-unsigned-x64<0:15-7.el8
0:15-7.el8
redhat/fwupd<0:1.1.4-2.el8_0
0:1.1.4-2.el8_0
redhat/grub2<1:2.02-87.el8_0
1:2.02-87.el8_0
redhat/shim<0:15-14.el8_0
0:15-14.el8_0
redhat/fwupd<0:1.1.4-2.el8_1
0:1.1.4-2.el8_1
redhat/grub2<1:2.02-87.el8_1
1:2.02-87.el8_1
redhat/shim<0:15-14.el8_1
0:15-14.el8_1
Gnu Grub2<2.06
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Eus=8.1
Redhat Enterprise Linux Eus=8.2
Redhat Enterprise Linux Server Aus=8.2
Redhat Enterprise Linux Server Tus=8.2
openSUSE Leap=15.1
openSUSE Leap=15.2
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
redhat/grub<2.06
2.06
debian/grub2
2.06-3~deb11u6
2.06-13+deb12u1
2.12-5

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-14311?

    CVE-2020-14311 is a vulnerability in grub2 that can lead to a heap-based buffer overflow.

  • How severe is CVE-2020-14311?

    CVE-2020-14311 has a severity score of 5.7, which is considered medium.

  • Which software is affected by CVE-2020-14311?

    grub2 versions before 2.06 and fwupdate versions 0:12-6.el7_8 are affected by CVE-2020-14311.

  • What is the remedy for CVE-2020-14311?

    To fix CVE-2020-14311, update grub2 to version 2.06 or fwupdate to version 0:12-6.el7_8.

  • Where can I find more information about CVE-2020-14311?

    You can find more information about CVE-2020-14311 at the following references: [link1](https://access.redhat.com/errata/RHSA-2020:3216), [link2](https://access.redhat.com/security/cve/cve-2020-14311), [link3](https://access.redhat.com/errata/RHSA-2020:3217)

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