PT-2008-4495 · Microsoft · Crypto Api

Alexander Klink · Published 2008-07-07 · Updated 2018-10-11 · CVE-2008-3068

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions: Microsoft Crypto API versions 5.131.2600.2180 through 6.0

Description: The issue allows remote attackers to obtain reading times and IP addresses of recipients, and port-scan results, by using a crafted certificate with an Authority Information Access (AIA) extension in a S/MIME e-mail message or signed document. This is due to the Microsoft Crypto API performing Certificate Revocation List (CRL) checks by using an arbitrary URL from a certificate.

Recommendations: For Microsoft Crypto API versions 5.131.2600.2180 through 6.0, consider restricting access to the Authority Information Access (AIA) extension to minimize the risk of exploitation. As a temporary workaround, avoid using the AIA extension in certificates until a patch is available.

Fix

Related Identifiers

CVE-2008-3068

Affected Products

Crypto Api

References · 16

• https://nvd.nist.gov/vuln/detail/CVE-2008-3068 · Security Note
• https://klink.name/security/aklink-sa-2008-002-outlook-smime.txt · Note
• https://klink.name/security/aklink-sa-2008-004-office2007-signatures.txt · Note
• https://cynops.de/advisories/AKLINK-SA-2008-004.txt · Note
• http://securitytracker.com/id?1019736 · Note
• https://klink.name/security/aklink-sa-2008-003-live-mail-smime.txt · Note
• https://cynops.de/advisories/AKLINK-SA-2008-002.txt · Note
• http://securitytracker.com/id?1019738 · Note
• http://securityfocus.com/archive/1/494101/100/0/threaded · Note
• http://securityreason.com/securityalert/3978 · Note
• http://securitytracker.com/id?1019737 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3068 · Note
• http://securityfocus.com/archive/1/493947/100/0/threaded · Note
• http://securityfocus.com/bid/28548 · Note
• https://cynops.de/advisories/AKLINK-SA-2008-003.txt · Note