SB2017080706 - SUSE Linux update for Linux Kernel Live Patch 9 for SLE 12 SP2

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Race condition (CVE-ID: CVE-2017-7533)

The vulnerability allows a local user to execute arbitrary code with escalated privileges.

The vulnerability exists due to a race condition in the fsnotify implementation in the Linux kernel through 4.12.4. A local user can create an application, which leverages simultaneous execution of the inotify_handle_event and vfs_rename functions and trigger memory corruption and denials of service attack or execute arbitrary code on the target system with root privileges.

Successful exploitation of this vulnerability may allow a local user to obtain elevated privileges on the system.

Note: this vulnerability is being active exploited in the wild for 32-bit systems in August 2017.

2) Denial of service (CVE-ID: CVE-2017-7645)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to a flaw in the NFSv2/NFSv3 server in the nfsd subsystem. A remote attacker can use a long RPC reply related to net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c. and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

3) Denial of service (CVE-ID: CVE-2017-8797)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the Linux kernel NFSv4 Server due to insufficient validation of user-supplied input. A remote attacker on a system within the target mount's host address mask rang can send a specially crafted NFSv4 pNFS LAYOUTGET command via UDP, trigger an array deference error and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

4) Double free error (CVE-ID: CVE-2017-8890)

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

The inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c in the Linux kernel through 4.10.15 allows attackers to cause a denial of service (double free) or possibly have unspecified other impact by leveraging use of the accept system call.

5) Denial of service (CVE-ID: CVE-2017-9077)

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists due to an error in the tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c. A local attacker can use specially crafted system calls to cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

6) Denial of service (CVE-ID: CVE-2017-9242)

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists due to an error in the __ip6_append_data function when checking whether an overwrite of an skb data structure may occur. A local attacker can use specially crafted system calls and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

Remediation

Install update from vendor's website.

References

• https://lists.opensuse.org/opensuse-security-announce/2017-08/msg00012.html