Medium [CVE-2024-45780] Grub2: fs/tar: integer overflow causes heap oob write
This medium-severity Red Hat Linux advisory covers CVE-2024-45780.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
A flaw was found in grub2. When reading tar files, grub2 allocates an internal buffer for the file name.
However, it fails to properly verify the allocation against possible integer overflows. It's possible to cause the allocation length to overflow with a crafted tar file, leading to a heap out-of-bounds write.
This flaw eventually allows an attacker to circumvent secure boot protections. To exploit this flaw, an attacker needs to trick a user into running grub2 with a specially crafted tar file system image, limiting the exposure of this flaw.
For this reason, this vulnerability has been rated with a Moderate severity. The grub2 package as shipped in Red Hat Enterprise Linux 7, 8, 9 and in Red Hat OpenShift Container Platform 4 is not affected by this vulnerability because the tar module is not built, so this issue is not applicable.
Red Hat severity: Moderate — CVSS 6.7 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.
Is CVE-2024-45780 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2024-45780 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2024-45780?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Mitigation checklist
- Do not run grub2 in an untrusted environment, specifically with a tar file system image.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
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