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Vulnerability Details : CVE-2009-4484 (1 public exploit)

Multiple stack-based buffer overflows in the CertDecoder::GetName function in src/asn.cpp in TaoCrypt in yaSSL before 1.9.9, as used in mysqld in MySQL 5.0.x before 5.0.90, MySQL 5.1.x before 5.1.43, MySQL 5.5.x through 5.5.0-m2, and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption and daemon crash) by establishing an SSL connection and sending an X.509 client certificate with a crafted name field, as demonstrated by and the vd_mysql5 module in VulnDisco Pack Professional 8.11. NOTE: this was originally reported for MySQL 5.0.51a.
Publish Date : 2009-12-30 Last Update Date : 2010-03-26
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of ServiceExecute CodeOverflowMemory corruption
CWE ID 119

- Vendor Statements

Not vulnerable. This issue did not affect the versions of mysql as shipped with Red Hat Enterprise Linux 3, 4, or 5. The packages use OpenSSL and not yaSSL.
Source: Redhat

- Related OVAL Definitions

Title Definition Id Class Family
CVE-2009-4484 unix
DSA-1997 mysql-dfsg-5.0 -- several vulnerabilities oval:org.mitre.oval:def:6799 unix
DSA-1997-1 mysql-dfsg-5.0 - several vulnerabilities oval:org.mitre.oval:def:20084 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2009-4484

# Product Type Vendor Product Version Update Edition Language
1 Application Mysql Mysql 5.0.51a Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Mysql Mysql 1

MLIST [dailydave] 20100126 New db bugs
MLIST [commits] 20100113 bzr commit into mysql-5.0-bugteam branch (ramil:2838) Bug#50227
SECTRACK 1023402
SECTRACK 1023513
BID 37974 RETIRED: yaSSL SSL Certificate Handling Remote Buffer Overflow Vulnerability Release Date:2010-01-27
BID 37943 MySQL with yaSSL SSL Certificate Handling Remote Stack Buffer Overflow Vulnerability Release Date:2012-03-12
BID 37640 MySQL 5.0.51a Unspecified Remote Code Execution Vulnerability Release Date:2012-03-12
OSVDB 61956
VUPEN ADV-2010-0236
MLIST [dailydave] 20100106 0day demos
XF mysql-unspecified-bo(55416) CONFIRM CONFIRM CONFIRM

- Vulnerability Conditions

Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)

- Metasploit Modules Related To CVE-2009-4484

MySQL yaSSL CertDecoder::GetName Buffer Overflow
This module exploits a stack buffer overflow in the yaSSL (1.9.8 and earlier) implementation bundled with MySQL. By sending a specially crafted client certificate, an attacker can execute arbitrary code. This vulnerability is present within the CertDecoder::GetName function inside "taocrypt/src/asn.cpp". However, the stack buffer that is written to exists within a parent function's stack frame. NOTE: This vulnerability requires a non-default configuration. First, the attacker must be able to pass the host-based authentication. Next, the server must be configured to listen on an accessible network interface. Lastly, the server must have been manually configured to use SSL. The binary from version 5.5.0-m2 was built with /GS and /SafeSEH. During testing on Windows XP SP3, these protections successfully prevented exploitation. Testing was also done with mysql on Ubuntu 9.04. Although the vulnerable code is present, both version 5.5.0-m2 built from source and version 5.0.75 from a binary package were not exploitable due to the use of the compiler's FORTIFY feature. Although suse11 was mentioned in the original blog post, the binary package they provide does not contain yaSSL or support SSL.
Module type : exploit Rank : good Platforms : Linux

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