SB2017101941 - Red Hat update for kernel-rt
Published: October 19, 2017 Updated: October 11, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 9 secuirty vulnerabilities.
1) Stack-based buffer overflow (CVE-ID: CVE-2016-8399)
The vulnerability allows a local user to cause kernel panic or escalate privileges.
The vulnerability exists due to a boundary error when crating an ICMP header. A local user can create a very short ICMP header and execute arbitrary code within the contest of the kernel.
Successful exploitation of the vulnerability may allow a local user to escalate privileges on the system.
2) Privilege escalation (CVE-ID: CVE-2017-1000111)
The vulnerability allows a local attacker to gain elevated privileges on the target system.The weakness exists in the packet_set_ring function due to improper implementation of raw packet sockets in the networking subsystem of the affected software that handles synchronization. A local attacker with CAP_NET_RAW permissions can open a raw packet socket, trigger a race condition, eventually cause use-after-free error and execute arbitrary code with root privileges.
Successful exploitation of the vulnerability may result in system compromise.
3) Privilege escalation (CVE-ID: CVE-2017-1000112)
The vulnerability allows a local attacker to gain elevated privileges on the target system.The weakness exists due to race condition in the UDP Fragmentation Offload (UFO) code. A local attacker can send specially crafted UFO packets, trigger memory corruption and execute arbitrary code with elevated privileges.
Successful exploitation of the vulnerability may result in system compromise.
4) NULL pointer dereference (CVE-ID: CVE-2017-11176)
The vulnerability allows a remote attacker to cause DoS condition.
The vulnerability exists due to the mq_notify function does not set the sock pointer to NULL upon entry into the retry logic. A remote attacker can trigger use-after-free error during a user-space close of a Netlink socket and cause the service to crash.
5) Divide by zero (CVE-ID: CVE-2017-14106)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists due to divide-by-zero error in the tcp_disconnect() function in net/ipv4/tcp.c. A local attacker can trigger a disconnect within a certain tcp_recvmsg code path and cause kernel panic.
Successful exploitation of the vulnerability results in denial of service.
6) Buffer overflow (CVE-ID: CVE-2017-7184)
The vulnerability allows a local attacker to execute arbitrary code on the target system with escalated privileges.The vulnerability exists due to boundary error in xfrm_replay_verify_len() function in net/xfrm/xfrm_user.c in Linux kernel when validating data after an XFRM_MSG_NEWAE update. A local use can trigger heap-based buffer overflow by leveraging the CAP_NET_ADMIN capability and execute arbitrary code on the target system with root privileges.
Successful exploitation of this vulnerability may allow an attacker to compromise vulnerable system.
This vulnerability was demonstrated during the Pwn2Own competition at CanSecWest 2017 for the Ubuntu 16.10 linux-image-* package 4.8.0.41.52.
7) Buffer overflow (CVE-ID: CVE-2017-7541)
The vulnerability allows a local attacker to execute arbitrary code on the target system with elevated privileges.
The vulnerability exists due to boundary error in brcmf_cfg80211_mgmt_tx() function in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the Linux kernel before 4.12.3. A local user can create a specially crafted NL80211_CMD_FRAME Netlink packet and trigger DoS conditions or execute arbitrary code on the target system with elevated privileges.
Successful exploitation of this vulnerability may allow an attacker to obtain elevated privileges.
8) Denial of service (CVE-ID: CVE-2017-7542)
The vulnerability allows a local attacker to cause DoS condition on the target system.The weakness exists in the ip6_find_1stfragopt function in net/ipv6/output_core.c due to leveraging the ability to open a raw socket. A local attacker can trigger integer overflow and infinite loop and cause a denial of service.
9) Out-of-bounds read (CVE-ID: CVE-2017-7558)
The vulnerability allows a local attacker to obtain potentially sensitive information.The weakness exists due to put-of-bounds read in the inet_diag_msg_sctpaddrs_fill(), inet_diag_msg_sctpladdrs_fill(), and sctp_get_sctp_info() functions in 'net/sctp/sctp_diag.c'. A local attacker can gain access to important data in portions of slab memory on the target system.
Remediation
Install update from vendor's website.