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CVE-2017-8923

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5300-3
Posted Mar 7, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5300-3 - USN-5300-1 fixed vulnerabilities in PHP. This update provides the corresponding updates for Ubuntu 21.10. It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. It was discovered that PHP incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service, or possibly obtain sensitive information. It was discovered that PHP incorrectly handled certain scripts with XML parsing functions. An attacker could possibly use this issue to obtain sensitive information.

tags | advisory, denial of service, php, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-8923, CVE-2017-9119, CVE-2021-21707
SHA-256 | 79f9d135d4d4a7c56dc43a848d48ffdb653c44069b4fe34f8a66deeb9811750f
Ubuntu Security Notice USN-5300-2
Posted Mar 3, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5300-2 - USN-5300-1 fixed vulnerabilities in PHP. This update provides the corresponding updates for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. It was discovered that PHP incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service, or possibly obtain sensitive information. It was discovered that PHP incorrectly handled certain scripts with XML parsing functions. An attacker could possibly use this issue to obtain sensitive information.

tags | advisory, denial of service, php, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-8923, CVE-2017-9119, CVE-2021-21707
SHA-256 | 8d289bff69aa5a1c07a2ec7e6f761299daae4511e4dcce44a32c652a3e06a38e
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