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Samba Denial of Service Vulnerabilities

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Release Date:  2004-09-14    Views:  12,325

Secunia Advisory SA12516

Where:

From local network

Impact:

DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Two vulnerabilities have been reported in Samba, which can be exploited by malicious people to cause a DoS (Denial of Service).

1) An error exists in smbd within the ASN.1 parsing functionality. This can be exploited via specially crafted packets during authentication to spawn many new processes, which enter infinite loops.

Successful exploitation may exhaust all available memory resources.

2) An input validation error exists in nmbd within the "process_logon_packet()" function when processing mailslot packets. This can be exploited to crash the daemon via a specially crafted "SAM_UAS_CHANGE" request.

Successful exploitation requires that the daemon has been configured to process domain logons ("domain logons = yes" in smb.conf).

The vulnerabilities affect version 3.0.6 and prior.


Solution:
Update to version 3.0.7.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Discovered by anonymous person and reported via iDEFENSE.

Original Advisory:
Samba:
http://us3.samba.org/samba/history/3.0_DOS_sept04_announce.txt

iDEFENSE:
http://www.idefense.com/application/poi/display?id=138&type=vulnerabilities
http://www.idefense.com/application/poi/display?id=139&type=vulnerabilities

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Samba Denial of Service Vulnerabilities

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