SB2016113002 - Ubuntu update for Linux kernel
Published: November 30, 2016
Security Bulletin ID
SB2016113002
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Privilege escalation (CVE-ID: CVE-2016-7425)
CWE-ID: CWE-805 - Buffer Access with Incorrect Length Value
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to gain elevated privileges on the target system.
The weakness is due to insufficient restriction of length field by arcmsr_iop_message_xfer function in drivers/scsi/arcmsr/arcmsr_hba.c. By sending an ARCMSR_MESSAGE_WRITE_WQBUFFER control code, attackers can gain elevated privileges and trigger a heap-based buffer overflow.
Success fule exploitation of the vulnerability may result in denial of service on the vulnerable system.
2) Denial of service (CVE-ID: CVE-2016-8658)
CWE-ID: CWE-121 - Stack-based buffer overflow
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 user to cause DoS conditions on the target system.
The weakness exists due to stack-based buffer overfow in the brcmf_cfg80211_start_ap function in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c. By using a long SSID Information Element in a command to a Netlink socket, attackers can trigger a system crash.
Successful exploitation of the vulnerability may result in denial of service and further attacks on the vulnerable system.
Remediation
Install update from vendor's website.