#VU33636 NULL pointer dereference - CVE-2015-8551
Vulnerability identifier: #VU33636
Vulnerability risk: Medium
CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-476
Exploitation vector: Local
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 Xen, when running on an x86 system and using Linux 3.1.x through 4.3.x as the driver domain, allows local guest administrators to hit BUG conditions and cause a denial of service (NULL pointer dereference and host OS crash) by leveraging a system with access to a passed-through MSI or MSI-X capable physical PCI device and a crafted sequence of XEN_PCI_OP_* operations, aka "Linux pciback missing sanity checks." <a href="http://cwe.mitre.org/data/definitions/476. A remote attacker can perform a denial of service (DoS) attack.
Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
External links
https://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
https://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
https://lists.opensuse.org/opensuse-security-announce/2016-06/msg00059.html
https://lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.html
https://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html
https://lists.opensuse.org/opensuse-security-announce/2016-08/msg00044.html
https://lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html
https://www.debian.org/security/2016/dsa-3434
https://www.securityfocus.com/bid/79546
https://www.securitytracker.com/id/1034480
https://xenbits.xen.org/xsa/advisory-157.html
https://security.gentoo.org/glsa/201604-03
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
