Denial of service in OpenSSL

1) NULL pointer dereference

EUVDB-ID: #VU45695

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2009-1387

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the  dtls1_retrieve_buffered_fragment function in ssl/d1_both.c in OpenSSL. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack via an out-of-sequence DTLS handshake message, related to a "fragment bug.".

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenSSL: 0.9.0b - 0.9.8zh

CPE2.3

• cpe:2.3:a:openssl_software_foundation:openssl:0.9.0b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.1c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.2b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.3a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.4:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.5a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.6-15:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.7b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl_software_foundation:openssl:0.9.8zh:*:*:*:*:*:*:*

External links

https:ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2009-009.txt.asc
https://cvs.openssl.org/chngview?cn=17958
https://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02029444
https://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
https://lists.vmware.com/pipermail/security-announce/2010/000082.html
https://rt.openssl.org/Ticket/Display.html?id=1838&user=guest&pass=guest
https://secunia.com/advisories/35571
https://secunia.com/advisories/35685
https://secunia.com/advisories/35729
https://secunia.com/advisories/36533
https://secunia.com/advisories/37003
https://secunia.com/advisories/38794
https://secunia.com/advisories/38834
https://security.gentoo.org/glsa/glsa-200912-01.xml
https://sourceforge.net/mailarchive/message.php?msg_name=4AD43807.7080105%40users.sourceforge.net
https://voodoo-circle.sourceforge.net/sa/sa-20091012-01.html
https://www.openwall.com/lists/oss-security/2009/06/02/1
https://www.redhat.com/support/errata/RHSA-2009-1335.html
https://www.ubuntu.com/usn/USN-792-1
https://www.vupen.com/english/advisories/2010/0528
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10740
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7592

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.