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{"bugzilla": {"description": "php: Overflowing the length of string causes crash", "id": "1451700", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1451700"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.", "An integer overflow vulnerability in PHP can lead to a buffer overflow when constructing extremely long strings with the \".=\" operator. In unusual circumstances, this could be used by an attacker to cause an application to crash or possibly have other consequences."], "name": "CVE-2017-8923", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "php", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "php53", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "php", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "php", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "php:7.3/php", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "php:7.4/php", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:2", "fix_state": "Not affected", "package_name": "rh-php56-php", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:2", "fix_state": "Will not fix", "package_name": "rh-php70-php", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Will not fix", "package_name": "rh-php73-php", "product_name": "Red Hat Software Collections"}], "public_date": "2017-05-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-8923\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-8923"], "statement": "This issue is only practical to exploit on 32-bit systems, and then only when the memory limit is raised from its default to a value larger than 2 GiB. The default settings make exploitation impossible. For these reasons, PHP upstream developers do not consider this to be a security issue. Red Hat Software Collections and Red Hat Enterprise Linux 7 and later only distribute PHP built for 64-bit systems.", "threat_severity": "Moderate", "upstream_fix": "php 7.4.24, php 8.0.11"}