Fedora 27 update for kernel
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2017-17449 CVE-2017-17450 CVE-2017-17448 CVE-2017-17558 CVE-2017-8824 |
| CWE-ID | CWE-200 CWE-264 CWE-787 CWE-416 |
| Exploitation vector | Local |
| Public exploit | Public exploit code for vulnerability #5 is available. |
| Vulnerable software |
Fedora Operating systems & Components / Operating system kernel Operating systems & Components / Operating system package or component |
| Vendor | Fedoraproject |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Information disclosure
EUVDB-ID: #VU9769
Risk: Low
CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-17449
CWE-ID:
CWE-200 - Exposure of sensitive information to an unauthorized actor
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to obtain potentially sensitive information on the target system.
The weakness exists due to the __netlink_deliver_tap_skb function in net/netlink/af_netlink.c in the Linux kernel, when CONFIG_NLMON is enabled, does not restrict observations of Netlink messages to a single net namespace. A local attacker can leverage the CAP_NET_ADMIN capability to sniff an nlmon interface for all Netlink
activity on the system and read arbitrary files.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 27
kernel: before 4.14.6-300.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-129969aa8a
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.
2) Security restrictions bypass
EUVDB-ID: #VU9770
Risk: Low
CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-17450
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to bypass security restrictions on the target system.
The weakness exists due to net/netfilter/xt_osf.c in the Linux kernel through does not require the CAP_NET_ADMIN capability for add_callback and remove_callback operations. A local attacker can bypass intended access restrictions because the xt_osf_fingers data structure is shared across all net namespaces.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 27
kernel: before 4.14.6-300.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-129969aa8a
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.
3) Security restrictions bypass
EUVDB-ID: #VU9768
Risk: Low
CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-17448
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to bypass security restrictions on the target system.
The weakness exists due to net/netfilter/nfnetlink_cthelper.c in the Linux kernel does not require the CAP_NET_ADMIN capability for new, get, and del operations. A local attacker can bypass intended access
restrictions because the nfnl_cthelper_list data structure is shared
across all net namespaces.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 27
kernel: before 4.14.6-300.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-129969aa8a
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.
4) Out-of-bounds write
EUVDB-ID: #VU9771
Risk: Low
CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-17558
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists due to the usb_destroy_configuration function in drivers/usb/core/config.c in the USB core subsystem in the Linux kernel does not consider the maximum number of configurations and interfaces before attempting to release resources. A local attacker can supply specially crafted USB device, trigger out-of-bounds write access and cause the system to crash.
Successful exploitation of the vulnerability results in denial of service.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 27
kernel: before 4.14.6-300.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-129969aa8a
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.
5) Use-after-free error
EUVDB-ID: #VU9767
Risk: Low
CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2017-8824
CWE-ID:
CWE-416 - Use After Free
Exploit availability: Yes
DescriptionThe vulnerability allows a local attacker to gain elevated privileges or cause DoS condition on the target system.
The weakness exists due to an error in the dccp_disconnect function in net/dccp/proto.c in the Linux kernel. A local attacker can make specially crafted AF_UNSPEC connect system call during the DCCP_LISTEN state, trigger use-after-free error and gain root privileges or cause the system to crash.
Install updates from vendor's repository.
Vulnerable software versionsFedora: 27
kernel: before 4.14.6-300.fc27
CPE2.3 External linkshttps://bodhi.fedoraproject.org/updates/FEDORA-2017-129969aa8a
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. However, proof of concept for this vulnerability is available.
