CVE-2023-7101

CVE Published	2023-12-24
Related CWE(s)	CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection'), CWE-94: Improper Control of Generation of Code ('Code Injection')
Related Vendor(s)	jmcnamara, fedoraproject, debian
Related Product(s)	fedora, spreadsheet\, debian_linux
Exploitation Reported (CISA KEV)	2024-01-02
CVSS 3 Base Score	7.8 (HIGH)
CVSS 3 Attack Complexity	LOW
CVSS 3 Attack Vector	LOCAL

Spreadsheet::ParseExcel version 0.65 is a Perl module used for parsing Excel files. Spreadsheet::ParseExcel is vulnerable to an arbitrary code execution (ACE) vulnerability due to passing unvalidated input from a file into a string-type “eval”. Specifically, the issue stems from the evaluation of Number format strings (not to be confused with printf-style format strings) within the Excel parsing logic.

Cyber Threat Graph Context

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Associated CAPEC Patterns

Leverage Executable Code in Non-Executable Files (CAPEC-35)

An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.

Manipulating User-Controlled Variables (CAPEC-77)

This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.

Code Injection (CAPEC-242)

An adversary exploits a weakness in input validation on the target to inject new code into that which is currently executing. This differs from code inclusion in that code inclusion involves the addition or replacement of a reference to a code file, which is subsequently loaded by the target and used as part of the code of some application.

References

CVE.org

View more information about CVE-2023-7101 on the official MITRE CVE website.

NIST National Vulnerability Database

CVE-2023-7101 on the NIST NVD.

CISA Known Exploited Vulnerabilities