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TITLE:
apt "apt-key" Key Verification Security Issue

SECUNIA ADVISORY ID:
SA46046

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46046/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46046

RELEASE DATE:
2011-09-23

DISCUSS ADVISORY:
http://secunia.com/advisories/46046/#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/46046/

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=46046

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 has been reported in apt, which can be exploited by
malicious people to bypass certain security features.

The security issue is caused due to "net-update" command of the
"apt-key" script not properly verifying downloaded keys, which can be
exploited to install malicious keys via Man-in-the-Middle (MitM)
attacks, potentially allowing attackers to e.g. install forged
packages.

Successful exploitation requires that apt is configured to support
this command (e.g. URI to the keyring archive needs to be set).

SOLUTION:
Do not use the "net-update" command. Manually verify installed keys.

PROVIDED AND/OR DISCOVERED BY:
Georgi Guninski

ORIGINAL ADVISORY:
Georgi Guninski:
http://archives.neohapsis.com/archives/fulldisclosure/2011-09/0256.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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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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Definitions: (Criticality, Where etc.)
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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.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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