CVE-2020-14310
Medium
Description
There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.
SeverityMedium
CVSS5.7
Exploit probability—
Product
Gnu Grub2
PublishedJul 31, 2020
First seenJul 31, 2020
Weakness typeCWE-190Integer overflowCWE-122CWE-122
How to fix
Update
- gnu grub22.06 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gnu grub2 | v < 2.06 | 2.06 |
| redhat enterprise_linux | 7.0, 8.0 | — |
| redhat enterprise_linux_eus | 8.1, 8.2 | — |
| redhat enterprise_linux_server_aus | 8.2 | — |
| redhat enterprise_linux_server_tus | 8.2 | — |
| opensuse leap | 15.1, 15.2 | — |
| canonical ubuntu_linux | 14.04, 16.04, 18.04, 20.04 | — |
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