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{"bugzilla": {"description": "bison: use-after-free via crafted input file containing a NULL byte can lead to DoS", "id": "1872737", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1872737"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '\\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison."], "name": "CVE-2020-24240", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "bison", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "bison", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "bison", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "bison", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2020-07-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-24240\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-24240"], "statement": "bison as shipped in Red Hat Enterprise Linux 7 and 8 does not reproduce this flaw. It properly detects the NULL byte and errors out accordingly instead of causing use-after-free. This is likely due to introduction of vulnerable code in a more recent version of bison.", "threat_severity": "Moderate", "upstream_fix": "bison 3.7.1"}