Cygwin setup.exe weak security

cygwin-setup-weak-security (44047)

Low Risk

Description:

Cygwin could provide weaker than expected security, caused by improper verification of package authenticity. A remote attacker could exploit this vulnerability by using a package list containing the MD5 checksum of a malicious package distributed by a spoofed mirror server or by using man-in-the-middle techniques to launch further attacks against the system.

*CVSS:

Base Score:	2.6
Access Vector:	Network
Access Complexity:	High
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	Partial
Availability Impact:	None
Temporal Score:	1.9
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Other

Remedy:

Upgrade to the latest version of Cygwin (2.573.2.3 or later), available from the Cygwin Web site. See References.

References:

• Cygwin Web site: Cygwin.
• SECOBJADV-2008-02: Cygwin Installation and Update Process can be Subverted Vulnerability.
• BID-30375: Cygwin 'setup.exe' Installation and Update Process Mirror Authenticity Verification Vulnerability
• CVE-2008-3323: setup.exe before 2.573.2.3 in Cygwin does not properly verify the authenticity of packages, which allows remote Cygwin mirror servers or man-in-the-middle attackers to execute arbitrary code via a package list containing the MD5 checksum of a Trojan horse package.
• SA31271: Cygwin Package Handling Security Issue
• VUPEN/ADV-2008-2321: Cygwin setup.exe Packages Verification Security Weakness

Platforms Affected:

• Cygwin Cygwin

Reported:

Jul 25, 2008

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email xforce@iss.net

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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