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{"bugzilla": {"description": "grub2: Observable Timing Discrepancy resulting side-channel attacks", "id": "2334771", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334771"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-208", "details": ["GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.", "A flaw was found in GRUB2. Affected versions of GRUB2 do not use a constant-time algorithm for grub_crypto_memcmp, which can allow side-channel attacks."], "name": "CVE-2024-56738", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "grub2", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "grub2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "grub2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2024-12-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56738\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56738\nhttps://savannah.gnu.org/bugs/?66603"], "statement": "Due to the extremely limited conditions needed for exploitation, this vulnerability is classified as low severity. Due to GRUB using libgcrypt during HTTPS operations, there is potential for a side-channel attack that could enable an attacker to infer TLS session key information. However, because GRUB runs in a single-threaded context during boot, it eliminates the common attack vector of timing measurements across threads, so it reduces the potential for exploitation in most situations. Additionally, many configurations offload HTTPS/TLS handling to UEFI or do not enable libgcrypt for HTTPS at all, leaving the vulnerable code path unused.", "threat_severity": "Moderate"}