It was found that the packet_set_ring() function of the Linux kernel's networking implementation did not properly validate certain block-size data. A local attacker with CAP_NET_RAW capability could use this flaw to trigger a buffer overflow resulting in a system crash or a privilege escalation.
Find out more about CVE-2017-7308 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue does not affect Red Hat Enterprise Linux 5.
In a default or common use of Red Hat Enterprise Linux 6 and 7 this issue does not allow an unprivileged local user elevate their privileges on the system. In order to exploit this issue the attacker needs CAP_NET_RAW capability, which needs to be granted by the administrator to the attacker's account. Since Red Hat Enterprise Linux 6 does not have namespaces support and Red Hat Enterprise Linux 7 does not have unprivileged user namespaces enabled by default, local unprivileged users also cannot abuse namespaces feature to grant this capability to themselves and elevate their privileges.
So, this issue does not affect Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 in the default configuration. Future updates for the respective releases will address this issue to secure non-default configurations.
In the non-default configuration mentioned above only Red Hat Enterprise Linux 7 is vulnerable to a privilege escalation. Red Hat Enterprise Linux 6 is vulnerable only to a denial of service (DoS) due to a system crash, hence the impact on Red Hat Enterprise Linux 6 is rated as being Moderate.
CVSS3 Base Score | 7 |
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CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Attack Vector | Local |
Attack Complexity | High |
Privileges Required | Low |
User Interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity Impact | High |
Availability Impact | High |
Platform | Errata | Release Date |
---|---|---|
Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) | RHSA-2017:1297 | 2017-05-25 |
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) | RHSA-2017:1298 | 2017-05-25 |
Red Hat Enterprise Linux 6 (kernel) | RHSA-2018:1854 | 2018-06-19 |
Red Hat Enterprise Linux 7 (kernel) | RHSA-2017:1308 | 2017-05-25 |
Platform | Package | State |
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Red Hat Enterprise Linux 5 | kernel | Not affected |