Medium [CVE-2024-45779] Grub2: fs/bfs: integer overflow leads to heap oob read in the bfs parser
This medium-severity Red Hat Linux advisory covers CVE-2024-45779.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
An integer overflow flaw was found in the BFS file system driver in grub2. When reading a file with an indirect extent map, grub2 fails to validate the number of extent entries to be read.
A crafted or corrupted BFS filesystem may cause an integer overflow during the file reading, leading to a heap of bounds read. As a consequence, sensitive data may be leaked, or grub2 will crash.
To exploit this flaw, an attacker needs to trick a user into running grub2 with a specially crafted BFS 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 BFS module is not built, so this issue is not applicable. Red Hat severity: Moderate — CVSS 6 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H).
Weakness: CWE-190.
Is CVE-2024-45779 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2024-45779 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-2024-45779?
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 BFS file system image.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
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