CVE-2017-2634: Null Pointer Dereference
A flaw was found in the linux kernels implementation of DCCP protocol in which a an application making a DCCP connection over IPV6 could crash a remote (or local) system. When attempting to send a DCCP reset packet, the system will incorrectly create the packet header and while updating the SNMP counters for this condition crash the kernel. The remote system would need to have both an application running as a DCCP server and have an IPV6 address routable.
This can result in the system crash or denial of service.
Upstream fix:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=f53dc67c5e7babafe239b93a11678b0e05bead51
Other sources
It was found that the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation before 2.6.22.17 used the IPv4-only inetskrebuildheader() function for both IPv4 and IPv6 DCCP connections, which could result in memory corruptions. A remote attacker could use this flaw to crash the system.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.6.22.17
Event History
Frequently Asked Questions
What is the severity of CVE-2017-2634?
CVE-2017-2634 is considered a medium severity vulnerability due to the potential for a remote attacker to cause a denial of service.
How do I fix CVE-2017-2634?
To remediate CVE-2017-2634, upgrade to a patched version of the Linux kernel or the affected Red Hat Enterprise Linux products.
Which versions of the Linux kernel are affected by CVE-2017-2634?
CVE-2017-2634 affects Linux kernel versions prior to 2.6.22.17.
Can CVE-2017-2634 affect IPv6 connections?
Yes, CVE-2017-2634 can affect both IPv4 and IPv6 DCCP connections due to the flawed implementation.
Are Red Hat Enterprise Linux products affected by CVE-2017-2634?
Yes, Red Hat Enterprise Linux Desktop and Server versions 5.0, along with specific versions, are affected by CVE-2017-2634.