SB2017080826 - SUSE Linux update for Linux Kernel Live Patch 20 for SLE 12
Published: August 8, 2017
Security Bulletin ID
SB2017080826
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
3
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Race condition (CVE-ID: CVE-2017-7533)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 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:A/U:Green
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)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
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-2017-9242)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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
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.