CVE-2022-23521
gitattributes parsing integer overflow in git
In short
Git has an integer overflow vulnerability when parsing the `.gitattributes` file with extremely large numbers of patterns or attribute names. A specially crafted repository can trigger this flaw, potentially allowing an attacker to execute arbitrary code on a user's machine.
Technical detail
Integer overflow in gitattributes parsing (CWE-190) occurs when processing files with excessive path patterns, attributes per pattern, or oversized attribute names. The vulnerability enables arbitrary heap reads/writes via crafted `.gitattributes` entries in repository history; exploitation requires a user to clone or interact with a malicious repository, with impact ranging from information disclosure to remote code execution.
Summary generated and translated by AI from the official description.
Git is distributed revision control system. gitattributes are a mechanism to allow defining attributes for paths. These attributes can be defined by adding a `.gitattributes` file to the repository, which contains a set of file patterns and the attributes that should be set for paths matching this pattern. When parsing gitattributes, multiple integer overflows can occur when there is a huge number of path patterns, a huge number of attributes for a single pattern, or when the declared attribute names are huge. These overflows can be triggered via a crafted `.gitattributes` file that may be part of the commit history. Git silently splits lines longer than 2KB when parsing gitattributes from a file, but not when parsing them from the index. Consequentially, the failure mode depends on whether the file exists in the working tree, the index or both. This integer overflow can result in arbitrary heap reads and writes, which may result in remote code execution. The problem has been patched in the versions published on 2023-01-17, going back to v2.30.7. Users are advised to upgrade. There are no known workarounds for this issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H