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TITLE:
UnrealIRCd Backdoor Security Issue and User Authentication Buffer
Overflow

SECUNIA ADVISORY ID:
SA40169

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/40169/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=40169

RELEASE DATE:
2010-06-25

DISCUSS ADVISORY:
http://secunia.com/advisories/40169/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/40169/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=40169

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:
A security issue and a vulnerability have been reported in
UnrealIRCd, which can be exploited by malicious people to cause a DoS
(Denial of Service) or compromise a vulnerable system.

1) The security issue is caused due to certain files being
distributed via e.g. the project's mirrors containing a backdoor.
This can be exploited to e.g. execute arbitrary shell commands by
sending specially crafted packets to the service.

Note: The backdoor is reported in the source code file of version
3.2.8.1 (e.g. "Unreal3.2.8.1.tar.gz") with an MD5 checksum of
752e46f2d873c1679fa99de3f52a274d. The MD5 checksum of legitimate
copies is 7b741e94e867c0a7370553fd01506c66.

2) A boundary error in the user authentication can be exploited to
cause a buffer overflow via an overly long username.

Successful exploitation of this vulnerability requires that
"allow::options::noident" is used (not used by default).

SOLUTION:
Ensure that you've installed a legitimate copy of UnrealIRCd version
3.2.8.1. Please see the vendor's advisories for additional details.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://www.unrealircd.com/txt/unrealsecadvisory.20090413.txt
http://www.unrealircd.com/txt/unrealsecadvisory.20100612.txt

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:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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