SB2017070714 - Path traversal in yaws.hyber Yaws

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2017-10974)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Yaws 1.91 allows Unauthenticated Remote File Disclosure via HTTP Directory Traversal with /%5C../ to port 8080. NOTE: this CVE is only about use of an initial /%5C sequence to defeat traversal protection mechanisms; the initial /%5C sequence was apparently not discussed in earlier research on this product.

Remediation

Install update from vendor's website.

References

• http://hyp3rlinx.altervista.org/advisories/YAWS-WEB-SERVER-v1.91-UNAUTHENTICATED-REMOTE-FILE-DISCLOSURE.txt
• http://www.securityfocus.com/bid/99515
• https://www.exploit-db.com/exploits/42303/