FreeBSD : cURL -- out of bounds read (ccace707-a8d8-11e7-ac58-b499baebfeaf)

Medium Nessus Plugin ID 103666


The remote FreeBSD host is missing a security-related update.


The cURL project reports :

FTP PWD response parser out of bounds read

libcurl may read outside of a heap allocated buffer when doing FTP.

When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the PWD command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses.

Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path.

A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault.


Update the affected package.

See Also

Plugin Details

Severity: Medium

ID: 103666

File Name: freebsd_pkg_ccace707a8d811e7ac58b499baebfeaf.nasl

Version: $Revision: 3.3 $

Type: local

Published: 2017/10/05

Modified: 2018/01/31

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P


Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:curl, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 2017/10/04

Vulnerability Publication Date: 2017/10/04

Reference Information

CVE: CVE-2017-1000254