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Zero Day Initiative Advisory 10-294

Zero Day Initiative Advisory 10-294
Posted Dec 25, 2010
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 10-294 - This vulnerability allows remote attackers to execute arbitrary code on systems with vulnerable installations of multiple products from multiple vendors that utilize the Uni RPC protocol. Authentication is not required to exploit this vulnerability. The specific flaw exists in the Uni RPC service (unirpcd.exe) which listens by default on TCP port 31438. The unirpc32.dll module implements an RPC protocol and is used by the Uni RPC service. While parsing a size value from an RPC packet header, an integer can overflow and consequently bypass a signed comparison. This controlled value is then used as the number of bytes to receive into a static heap buffer. By providing a specially crafted request, this heap buffer can overflow leading to arbitrary code execution under the context of the SYSTEM user.

tags | advisory, remote, overflow, arbitrary, tcp, code execution, protocol
MD5 | b83efd6fba2e350413a98a981b30fbf8

Zero Day Initiative Advisory 10-294

Change Mirror Download
ZDI-10-294: Rocket U2 Uni RPC Service Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-10-294

December 23, 2010

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Rocket

-- Affected Products:
Rocket U2

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 6257.
For further product information on the TippingPoint IPS, visit:

http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
systems with vulnerable installations of multiple products from multiple
vendors that utilize the Uni RPC protocol. Authentication is not
required to exploit this vulnerability.

The specific flaw exists in the Uni RPC service (unirpcd.exe) which
listens by default on TCP port 31438. The unirpc32.dll module implements
an RPC protocol and is used by the Uni RPC service. While parsing a size
value from an RPC packet header, an integer can overflow and
consequently bypass a signed comparison. This controlled value is then
used as the number of bytes to receive into a static heap buffer. By
providing a specially crafted request, this heap buffer can overflow
leading to arbitrary code execution under the context of the SYSTEM
user.

-- Vendor Response:
Rocket states:
Rocket U2 states that this issue was first fixed in: UniVerse 10.3.9 and
UniData 7.2.8. Recommended fix pack version: UniVerse 10.3.9 and above
or UniData 7.2.8 and above.
Please contact your software partner or U2BC@rs.com to obtain a fixed
version for UCC-676.

-- Disclosure Timeline:
2010-07-20 - Vulnerability reported to vendor
2010-12-23 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
* Ruben Santamarta

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, 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. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint 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, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

http://twitter.com/thezdi


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