#VU80042 Path traversal in pyramid - CVE-2023-40587

Vulnerability identifier: #VU80042

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-40587

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pyramid
Web applications / CMS

Vendor: Pylons Project

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing null-byte characters. A remote attacker can disclose content of "index.html" file exactly one directory above the location of the static view's file system path.

Mitigation
Install update from vendor's website.

Vulnerable software versions

pyramid: 2.0 - 2.0.1

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External links
https://github.com/Pylons/pyramid/commit/347d7750da6f45c7436dd0c31468885cc9343c85
https://github.com/python/cpython/issues/106242
https://github.com/python/cpython/pull/106816
https://github.com/Pylons/pyramid/security/advisories/GHSA-j8g2-6fc7-q8f8

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.