------------------------------------------------------------------------- Debian LTS Advisory DLA-3555-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Guilhem Moulin September 05, 2023 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : php7.3 Version : 7.3.31-1~deb10u5 CVE ID : CVE-2023-3823 CVE-2023-3824 Security issues were found in PHP, a widely-used open source general purpose scripting language, which could result in information disclosure, denial of service or potentially remote code execution. CVE-2023-3823 Various XML functions rely on libxml global state to track configuration variables, like whether external entities are loaded. This state is assumed to be unchanged unless the user explicitly changes it by calling appropriate function. Joas Schilling and Baptista Katapi discovered that, since the state is process-global, other modules — such as ImageMagick — may also use this library within the same process and change that global state for their internal purposes, and leave it in a state where external entities loading is enabled. This can lead to the situation where external XML is parsed with external entities loaded, which can lead to disclosure of any local files accessible to PHP. This vulnerable state may persist in the same process across many requests, until the process is shut down. CVE-2023-3824 Niels Dossche discovered that when loading a Phar file, while reading PHAR directory entries, insufficient length checking may lead to a stack buffer overflow, leading potentially to memory corruption or RCE. For Debian 10 buster, these problems have been fixed in version 7.3.31-1~deb10u5. We recommend that you upgrade your php7.3 packages. For the detailed security status of php7.3 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/php7.3 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
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