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TITLE:
Network Block Device Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA44596

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44596/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44596

RELEASE DATE:
2011-05-18

DISCUSS ADVISORY:
http://secunia.com/advisories/44596/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * CVE Reference(s)

http://secunia.com/advisories/44596/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=44596

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Two vulnerabilities have been discovered in Network Block Device
(nbd), which can be exploited by malicious people to cause a DoS
(Denial of Service).

1) An error within the "serveloop()" function in ndb-server.c can be
exploited to cause a NULL pointer dereference by sending certain
negotiation packets to a vulnerable server.

2) An error within the "negotiate()" function in nbd-server.c when
processing negotiation packets with an overly large "namelen" value
can be exploited to terminate the server.

The vulnerabilities are confirmed in version 2.9.21a. Other versions
may also be affected.

Note: Vulnerability #1 does not affect versions prior to 2.9.21.

SOLUTION:
Vulnerability #1 is fixed in the GIT repository. Use a firewall to
restrict access to trusted hosts only.

PROVIDED AND/OR DISCOVERED BY:
Alex Bligh

ORIGINAL ADVISORY:
http://sourceforge.net/mailarchive/message.php?msg_id=27511272

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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