FreeBSD : mysql -- mysql_real_connect buffer overflow vulnerability (835256b8-46ed-11d9-8ce0-00065be4b5b6)

Critical Nessus Plugin ID 19009


The remote FreeBSD host is missing one or more security-related updates.


The mysql_real_connect function doesn't properly handle DNS replies by copying the IP address into a buffer without any length checking. A specially crafted DNS reply may therefore be used to cause a buffer overflow on affected systems.

Note that whether this issue can be exploitable depends on the system library responsible for the gethostbyname function. The bug finder, Lukasz Wojtow, explaines this with the following words :

In glibc there is a limitation for an IP address to have only 4 bytes (obviously), but generally speaking the length of the address comes with a response for dns query (i know it sounds funny but read rfc1035 if you don't believe). This bug can occur on libraries where gethostbyname function takes length from dns's response


Update the affected packages.

See Also

Plugin Details

Severity: Critical

ID: 19009

File Name: freebsd_pkg_835256b846ed11d98ce000065be4b5b6.nasl

Version: $Revision: 1.17 $

Type: local

Published: 2005/07/13

Modified: 2015/05/13

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Temporal Score: 7.4

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:mysql-client, p-cpe:/a:freebsd:freebsd:mysql-server, cpe:/o:freebsd:freebsd

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2004/12/16

Vulnerability Publication Date: 2004/06/04

Reference Information

CVE: CVE-2004-0836

BID: 10981

CWE: 119