SB2020012834 - Path traversal in ntp

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2015-7851)

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:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

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

The vulnerability exists due to input validation error when processing directory traversal sequences in the save_config function in ntpd in ntp_control.c in NTP before 4.2.8p4, when used on systems that do not use '' or '/' characters for directory separation such as OpenVMS,. A remote authenticated attacker can send a specially crafted HTTP request and remote authenticated users to overwrite arbitrary files.

Remediation

Install update from vendor's website.

References

• http://support.ntp.org/bin/view/Main/NtpBug2918
• http://support.ntp.org/bin/view/Main/SecurityNotice
• http://www.talosintel.com/reports/TALOS-2015-0062/