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full-disclosure-uk: [Full-disclosure] ZDI-07-033: Samba lsa_io_t

[Full-disclosure] ZDI-07-033: Samba lsa_io_trans_names Heap Overflow Vulnerability

From: <zdi-disclosures_at_nospam>
Date: Tue May 15 2007 - 20:41:12 GMT
To: full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com, vulnwatch@vulnwatch.org, vulndiscuss@vulnwatch.org


ZDI-07-033: Samba lsa_io_trans_names Heap Overflow Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-07-033.html May 15, 2007

  • CVE ID: CVE-2007-2446
  • Affected Vendor: Samba
  • Affected Products: Samba 3.0.0 - 3.0.25rc3
  • TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since May 14, 2007 by Digital Vaccine protection filter ID 5349. For further product information on the TippingPoint IPS:

    http://www.tippingpoint.com

  • Vulnerability Details: This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Samba. User interaction is not required to exploit this vulnerability.

The specific flaw exists in the parsing of RPC requests to the LSA RPC interface. When parsing a request to LsarLookupSids/LsarLookupSids2, heap allocation is calculated based on user input. By specifying invalid values, heap blocks can be overwritten leading to remote code execution.

  • Vendor Response: Samba has issued an update to correct this vulnerability. More details can be found at:

http://us1.samba.org/samba/security/CVE-2007-2446.html

  • Disclosure Timeline: 2007.05.04 - Vulnerability reported to vendor 2007.05.14 - Digital Vaccine released to TippingPoint customers 2007.05.15 - Coordinated public release of advisory
  • Credit: This vulnerability was discovered by an anonymous researcher.
  • About the Zero Day Initiative (ZDI): Established by TippingPoint, a division of 3Com, The Zero Day Initiative (ZDI) represents a best-of-breed model for rewarding security researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is used. 3Com does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, 3Com provides its customers with zero day protection through its intrusion prevention technology. Explicit details regarding the specifics of the vulnerability are not exposed to any parties until an official vendor patch is publicly available. Furthermore, with the altruistic aim of helping to secure a broader user base, 3Com provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product.



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