OpenSSL server name extension data denial of service
| openssl-servername-dos (42666) |  Medium Risk |
Description:
OpenSSL is vulnerable to a denial of service, caused by a double-free error when handling server name extension data. If OpenSSL is compiled using non-default TLS server name extensions, a remote attacker could send a specially-crafted Client Hello packet to cause the affected application to crash.
*CVSS:
| Base Score: | 4.3 |
| Access Vector: | Network |
| Access Complexity: | Medium |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 3.2 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
Remedy:
Upgrade to the latest version of OpenSSL (0.9.8h or later), available from the OpenSSL Web site. See References.
References:
- NORTEL BULLETIN ID: 2008008922, Rev 1: Nortel Response to 2 Potential DoS Vulnerabilities in OpenSSL.
- NORTEL BULLETIN ID: 2008008922, Rev 2: Nortel Response to 2 Potential DoS Vulnerabilities in OpenSSL.
- NORTEL BULLETIN ID: 2008008922, Rev 3: Nortel Response to 2 Potential DoS Vulnerabilities in OpenSSL.
- OpenSSL Security Advisory [28-Mar-2008]: Two moderate severity security flaws have been fixed in OpenSSL 0.9.8h.
- OpenSSL Web site: OpenSSL: Source, Tarballs.
- BID-29405: OpenSSL Multiple Denial of Service Vulnerabilities
- CVE-2008-0891: Double free vulnerability in OpenSSL 0.9.8f and 0.9.8g, when the TLS server name extensions are enabled, allows remote attackers to cause a denial of service (crash) via a malformed Client Hello packet. NOTE: some of these details are obtained from third party information.
- GLSA-200806-08: OpenSSL: Denial of Service
- MDVSA-2008:107: Updated openssl package fixes denial of service vulnerabilities
- OSVDB ID: 45660: OpenSSL Server Name Extension Data Handling Crafted Packet Remote DoS
- SA30405: OpenSSL Two Denial of Service Vulnerabilities
- SA30852: Nortel Media Processing Server OpenSSL Multiple Vulnerabilities
- SA31228: cwRsync OpenSSL Denial of Service Vulnerabilities
- SECTRACK ID: 1020121: OpenSSL Server Name Extension Bug Lets Remote Users Crash the Target Application
- US-CERT VU#661475: OpenSSL Server Name extension Denial of Service
- USN-620-1: OpenSSL vulnerabilities
- VUPEN/ADV-2008-1680: OpenSSL Server Name Extension and Key Exchange Vulnerabilities
- VUPEN/ADV-2008-1937: Nortel Media Processing Server Multiple OpenSSL Vulnerabilities
Platforms Affected:
- Canonical Ubuntu 8.04 LTS
- Gentoo Linux
- MandrakeSoft Mandrake Linux 2008.1 X86_64
- MandrakeSoft Mandrake Linux 2008.1
- OpenSSL OpenSSL 0.9.8f
- OpenSSL OpenSSL 0.9.8g
Reported:
May 28, 2008
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.