Vulnerability: MS10-024 - Vulnerabilities in Microsoft Exchange and Windows SMTP Service could allow Denial of Service (981832)

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	Details
Vulnerability name/brief description	Vulnerabilities in Microsoft Exchange and Windows SMTP Service could allow Denial of Service (981832)
CVE/CAN name	CVE-2010-0024 CVE-2010-0025
Vendor threat level	Important
SophosLabs threat level	Low
Solution	MS10-024
Vendor description	This security update resolves one publicly disclosed vulnerability and one privately reported vulnerability in Microsoft Exchange and Windows SMTP Service. The more severe of these vulnerabilities could allow denial of service if an attacker sent a specially crafted DNS response to a computer running the SMTP service. By default, the SMTP component is not installed on Windows Server 2003, Windows Server 2003 x64 Edition, or Windows XP Professional x64 Edition.
SophosLabs comments	The publicly disclosed vulnerability (CVE-2010-0024) is a denial of service vulnerability that arises from the way the Microsoft Windows Simple Mail Transfer Protocol (SMTP) component incorrectly parses a specially crafted DNS Mail Exchanger (MX) record. However, his vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could cause the affected system to stop accepting requests. The privately disclosed vulnerability (CVE-2010-0025) is is an information disclosure vulnerability. It arises from the improper allocation of memory by the Microsoft Windows Simple Mail Transfer Protocol (SMTP) component when interpreting SMTP command responses. Again, this vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could be used to produce useful information that could be used to try to further compromise the affected system.
SophosLabs testing result	N/A
Currently known exploits	At the time of writing SophosLabs have not observed any malware attempting to exploit this vulnerability. Should this situation change samples will be analyzed and we will take action as necessary.
First sample seen	N/A
Discovery date	13th April 2010
Affected software	Microsoft Windows 2000 Service Pack 4 Windows XP Service Pack 2 and Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Windows Server 2003 x64 Edition Service Pack 2 Windows Server 2003 with SP2 for Itanium-based Systems Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 R2 for x64-based Systems Microsoft Exchange Server 2000 Service Pack 3 Microsoft Exchange Server 2003 Service Pack 2 Microsoft Exchange Server 2007 Service Pack 1 for x64-based Systems Microsoft Exchange Server 2007 Service Pack 2 for x64-based Systems Microsoft Exchange Server 2010 for x64-based Systems
References	http://www.microsoft.com/technet/security/bulletin/MS10-024.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0024 http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0025
Credits	MAPP
Revisions	13th April 2010 - Initial analysis written

Explanation of terms

Vulnerability Name/Brief Description:
Vendor identifier plus a brief description of the type of attack.

CVE/CAN Name:
Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.

Vendor Threat Level:
Threat level assigned by the vendor

SophosLabs Threat Level:
Threat level assigned by SophosLabs

• LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
• MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
• HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
• CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.

Solution:
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Vendor Description:
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SophosLabs Comments:
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SophosLabs Testing Result:
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Currently Known Exploits:
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First Sample Seen:
Date of the first sample seen by SophosLabs.

Discovery Date:
Date of the earliest known publically disclosed advisory.

Affected Software:
Vulnerable platforms and software versions.