The check_connection function in sql_parse.cc in MySQL 4.0.x up to 4.0.26, 4.1.x up to 4.1.18, and 5.0.x up to 5.0.20 allows remote attackers to read portions of memory via a username without a trailing null byte, which causes a buffer over-read.

The version of MySQL installed on the remote host is earlier than 4.0.27 / 4.1.19 / 5.0.21.  As such, it is potentially affected by the following vulnerabilities :

  - A remote attacker may be able to read portions of memory     by sending a specially crafted login packet in which the     username does not have a trailing NULL. (CVE-2006-1516)

  - A remote attacker may be able to read portions of memory     by sending a specially crafted COM_TABLE_DUMP request     with an incorrect packet length. (CVE-2006-1517)

  - A buffer overflow in the 'open_table()' function could     allow a remote, authenticated attacker to execute     arbitrary code via specially crafted COM_TABLE_DUMP     packets. (CVE-2006-1518)

MySQL did not correctly handle NULL as the second argument to the str_to_date() function. An authenticated user could exploit this to crash the server.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Attackers could read portions of memory by using a user name with trailing null byte or via COM_TABLE_DUMP command (CVE-2006-1516, CVE-2006-1517). Attackers could execute arbitrary code by causing a buffer overflow via specially crafted COM_TABLE_DUMP packets (CVE-2006-1518).

The remote host is running a version of Mac OS X 10.4 that is older than version 10.4.9 or a version of Mac OS X 10.3 that does not have Security Update 2007-003 applied. This update contains several security fixes for the following programs :

 - ColorSync
 - CoreGraphics
 - Crash Reporter
 - CUPS
 - Disk Images
 - DS Plugins
 - Flash Player
 - GNU Tar
 - HFS
 - HID Family
 - ImageIO
 - Kernel
 - MySQL server
 - Networking
 - OpenSSH
 - Printing
 - QuickDraw Manager
 - servermgrd
 - SMB File Server
 - Software Update
 - sudo 
 - WebLog

The remote host is running a version of Mac OS X 10.4 which is older than version 10.4.9 or a version of Mac OS X 10.3 which does not have Security Update 2007-003 applied.

This update contains several security fixes for the following programs :

 - ColorSync
 - CoreGraphics
 - Crash Reporter
 - CUPS
 - Disk Images
 - DS Plugins
 - Flash Player
 - GNU Tar
 - HFS
 - HID Family
 - ImageIO
 - Kernel
 - MySQL server
 - Networking
 - OpenSSH
 - Printing
 - QuickDraw Manager
 - servermgrd
 - SMB File Server
 - Software Update
 - sudo 
 - WebLog

Several vulnerabilities have been discovered in MySQL, a popular SQL database. The Common Vulnerabilities and Exposures Project identifies the following problems :

  - CVE-2006-0903     Improper handling of SQL queries containing the NULL     character allows local users to bypass logging     mechanisms.

  - CVE-2006-1516     Usernames without a trailing null byte allow remote     attackers to read portions of memory.

  - CVE-2006-1517     A request with an incorrect packet length allows remote     attackers to obtain sensitive information.

  - CVE-2006-1518     Specially crafted request packets with invalid length     values allow the execution of arbitrary code.

The following vulnerability matrix shows which version of MySQL in which distribution has this problem fixed :

                   woody            sarge            sid                mysql            3.23.49-8.15     n/a              n/a                mysql-dfsg       n/a              4.0.24-10sarge2  n/a                mysql-dfsg-4.1   n/a              4.1.11a-4sarge3  n/a                mysql-dfsg-5.0   n/a              n/a              5.0.21-3

Updated mysql packages that fix multiple security flaws are now available.

This update has been rated as having important security impact by the Red Hat Security Response Team.

MySQL is a multi-user, multi-threaded SQL database server. MySQL is a client/server implementation consisting of a server daemon (mysqld) and many different client programs and libraries.

A flaw was found in the way the MySQL mysql_real_escape() function escaped strings when operating in a multibyte character encoding. An attacker could provide an application a carefully crafted string containing invalidly-encoded characters which may be improperly escaped, leading to the injection of malicious SQL commands.
(CVE-2006-2753)

An information disclosure flaw was found in the way the MySQL server processed malformed usernames. An attacker could view a small portion of server memory by supplying an anonymous login username which was not null terminated. (CVE-2006-1516)

An information disclosure flaw was found in the way the MySQL server executed the COM_TABLE_DUMP command. An authenticated malicious user could send a specially crafted packet to the MySQL server which returned random unallocated memory. (CVE-2006-1517)

A log file obfuscation flaw was found in the way the mysql_real_query() function creates log file entries. An attacker with the the ability to call the mysql_real_query() function against a mysql server can obfuscate the entry the server will write to the log file. However, an attacker needed to have complete control over a server in order to attempt this attack. (CVE-2006-0903)

This update also fixes numerous non-security-related flaws, such as intermittent authentication failures.

All users of mysql are advised to upgrade to these updated packages containing MySQL version 4.1.20, which is not vulnerable to these issues.

New mysql packages are available for Slackware 9.1, 10.0, 10.1, 10.2 and -current to fix security issues. The MySQL packages shipped with Slackware 9.1, 10.0, and 10.1 may possibly leak sensitive information found in uninitialized memory to authenticated users. This is fixed in the new packages, and was already patched in Slackware 10.2 and
-current. Since the vulnerabilities require a valid login and/or access to the database server, the risk is moderate. Slackware does not provide network access to a MySQL database by default.

Secunia reports :

MySQL have some vulnerabilities, which can be exploited by malicious users to disclose potentially sensitive information and compromise a vulnerable system.

1) An error within the code that generates an error response to an invalid COM_TABLE_DUMP packet can be exploited by an authenticated client to disclosure certain memory content of the server process.

2) A boundary error within the handling of specially crafted invalid COM_TABLE_DUMP packets can be exploited by an authenticated client to cause a buffer overflow and allows arbitrary code execution.

3) An error within the handling of malformed login packets can be exploited to disclosure certain memory content of the server process in the error messages.

The MySQL database server on the remote host reads from uninitialized memory when processing a specially crafted login packet.  An unauthenticated attacker may be able to exploit this flaw to obtain sensitive information from the affected host as returned in an error packet.

Stefano Di Paola discovered an information leak in the login packet parser. By sending a specially crafted malformed login packet, a remote attacker could exploit this to read a random piece of memory, which could potentially reveal sensitive data. (CVE-2006-1516)

Stefano Di Paola also found a similar information leak in the parser for the COM_TABLE_DUMP request. (CVE-2006-1517).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The check_connection function in sql_parse.cc in MySQL 4.0.x up to 4.0.26, 4.1.x up to 4.1.18, and 5.0.x up to 5.0.20 allows remote attackers to read portions of memory via a username without a trailing null byte, which causes a buffer over-read. (CVE-2006-1516)

sql_parse.cc in MySQL 4.0.x up to 4.0.26, 4.1.x up to 4.1.18, and 5.0.x up to 5.0.20 allows remote attackers to obtain sensitive information via a COM_TABLE_DUMP request with an incorrect packet length, which includes portions of memory in an error message.
(CVE-2006-1517)

Updated packages have been patched to correct these issues.

The remote host is affected by the vulnerability described in GLSA-200605-13 (MySQL: Information leakage)

    The processing of the COM_TABLE_DUMP command by a MySQL server fails to     properly validate packets that arrive from the client via a network     socket.
  Impact :

    By crafting specific malicious packets an attacker could gather     confidential information from the memory of a MySQL server process, for     example results of queries by other users or applications. By using PHP     code injection or similar techniques it would be possible to exploit     this flaw through web applications that use MySQL as a database     backend.
    Note that on 5.x versions it is possible to overwrite the stack and     execute arbitrary code with this technique. Users of MySQL 5.x are     urged to upgrade to the latest available version.
  Workaround :

    There is no known workaround at this time.

New mysql packages are available for Slackware 10.2 and -current to fix security issues. The MySQL package shipped with Slackware 10.2 may possibly leak sensitive information found in uninitialized memory to authenticated users. The MySQL package previously in Slackware
-current also suffered from these flaws, but an additional overflow could allow arbitrary code execution. Since the vulnerabilities require a valid login and/or access to the database server, the risk is moderate. Slackware does not provide network access to a MySQL database by default.

According to its version number, the installation of MySQL on the remote host may be prone to multiple buffer overflows.  The MySQL server is also vulnerable to multiple information disclosure flaws.  An attacker exploiting the overflow would need to be able to authenticate to the MySQL server.  An attacker exploiting the information disclosure flaw would only need to be able to send malformed 'login' packets to the server. This version of MySQL is also prone to a remote Denial of Service (DoS) due to an inability to properly parse a malformed call to the date_format function.

ID	Name	Product	Family	Severity
17697	MySQL < 4.0.27 / 4.1.19 / 5.0.21 Multiple Vulnerabilities	Nessus	Databases	medium
27881	Ubuntu 5.10 : mysql-dfsg-4.1 vulnerability (USN-306-1)	Nessus	Ubuntu Local Security Checks	medium
27356	openSUSE 10 Security Update : mysql (mysql-1312)	Nessus	SuSE Local Security Checks	medium
3947	Mac OS X < 10.4.9 Multiple Vulnerabilities (Security Update 2007-003)	Nessus Network Monitor	Web Clients	high
24811	Mac OS X < 10.4.9 Multiple Vulnerabilities (Security Update 2007-003)	Nessus	MacOS X Local Security Checks	critical
22621	Debian DSA-1079-1 : mysql-dfsg - several vulnerabilities	Nessus	Debian Local Security Checks	medium
22615	Debian DSA-1073-1 : mysql-dfsg-4.1 - several vulnerabilities	Nessus	Debian Local Security Checks	medium
22613	Debian DSA-1071-1 : mysql - several vulnerabilities	Nessus	Debian Local Security Checks	medium
22000	CentOS 4 : mysql (CESA-2006:0544)	Nessus	CentOS Local Security Checks	high
21683	RHEL 4 : mysql (RHSA-2006:0544)	Nessus	Red Hat Local Security Checks	high
21639	Slackware 10.0 / 10.1 / 10.2 / 9.1 / current : mysql (SSA:2006-155-01)	Nessus	Slackware Local Security Checks	high
21633	FreeBSD : MySQL -- Information Disclosure and Buffer Overflow Vulnerabilities (4913886c-e875-11da-b9f4-00123ffe8333)	Nessus	FreeBSD Local Security Checks	medium
21632	MySQL Anonymous Login Handshake Remote Information Disclosure	Nessus	Databases	medium
21377	Ubuntu 5.04 / 5.10 : mysql-dfsg-4.1, mysql-dfsg vulnerabilities (USN-283-1)	Nessus	Ubuntu Local Security Checks	medium
21359	Mandrake Linux Security Advisory : MySQL (MDKSA-2006:084)	Nessus	Mandriva Local Security Checks	medium
21355	GLSA-200605-13 : MySQL: Information leakage	Nessus	Gentoo Local Security Checks	medium
21345	Slackware 10.2 / current : mysql (SSA:2006-129-02)	Nessus	Slackware Local Security Checks	medium
3527	Oracle MySQL Remote Overflow and Information Disclosure Vulnerabilities	Nessus Network Monitor	Database	medium
801163	MySQL Remote Overflow and Information Disclosure Vulnerabilities	Log Correlation Engine	Database	medium

Detections

Analytics

CVE-2006-1516

critical

Tenable Plugins

medium

medium

medium

high

critical

medium

medium

medium

high

high

high

medium

medium

medium

medium

medium

medium

medium

medium