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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.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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