Out-of-bounds write in atftp - CVE-2019-11365
Published: April 20, 2019 / Updated: September 29, 2020
Vulnerability identifier: #VU47132
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2019-11365
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Dennis Kaarsemaker
Affected software:
atftp
atftp
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
An issue was discovered in atftpd in atftp 0.7.1. A remote attacker may send a crafted packet triggering a stack-based buffer overflow due to an insecurely implemented strncpy call. The vulnerability is triggered by sending an error packet of 3 bytes or fewer. There are multiple instances of this vulnerable strncpy pattern within the code base, specifically within tftpd_file.c, tftp_file.c, tftpd_mtftp.c, and tftp_mtftp.c.
How to mitigate CVE-2019-11365
Install update from vendor's website.
Sources
- https://lists.debian.org/debian-lts-announce/2019/05/msg00012.html
- https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities
- https://seclists.org/bugtraq/2019/May/16
- https://security.gentoo.org/glsa/202003-14
- https://sourceforge.net/p/atftp/code/ci/abed7d245d8e8bdfeab24f9f7f55a52c3140f96b/
- https://usn.ubuntu.com/4540-1/
- https://www.debian.org/security/2019/dsa-4438