SB2021062329 - Ubuntu update for linux
Published: June 23, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 15 secuirty vulnerabilities.
1) Race condition (CVE-ID: CVE-2021-3609)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in the CAN BCM networking protocol (net/can/bcm.c) in the Linux kernel ranging from version 2.6.25 to mainline 5.13-rc6. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
2) Out-of-bounds write (CVE-ID: CVE-2021-33200)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in kernel/bpf/verifier.c. A local user can trigger an out-of-bounds write and escalate privileges on the system.
3) Input validation error (CVE-ID: CVE-2020-24586)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists in the 802.11 standard due to the affected device does not clear its cache/memory to remove fragments of an incomplete MSDU/MMPDU from previous session after reconnection/reassociation. A remote attacker on the local network can perform a fragment cache attack and perform a denial of service (DoS) attack.
4) Information disclosure (CVE-ID: CVE-2020-24587)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Windows Wireless Networking. A remote attacker on the local network can gain unauthorized access to sensitive information on the system.
5) Spoofing attack (CVE-ID: CVE-2020-24588)
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data in Windows Wireless Networking. A remote attacker on the local network can spoof page content.
6) Input validation error (CVE-ID: CVE-2020-26139)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to forwarding EAPOL frames even though the sender is not yet authenticated. A remote attacker on the local network can cause a denial of service (DoS) condition on the target system.
7) Input validation error (CVE-ID: CVE-2020-26141)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the Wi-Fi implementation does not verify the Message Integrity Check (authenticity) of fragmented TKIP frames. A remote attacker on the local network can inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol.
8) Input validation error (CVE-ID: CVE-2020-26145)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. A remote attacker on the local network can inject arbitrary network packets independent of the network configuration.
9) Input validation error (CVE-ID: CVE-2020-26147)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the WEP, WPA, WPA2, and WPA3 implementations reassemble fragments even though some of them were sent in plaintext. A remote attacker on the local network can inject packets and/or exfiltrate selected fragments
10) Race condition (CVE-ID: CVE-2021-23133)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in Linux kernel SCTP sockets (net/sctp/socket.c). If sctp_destroy_sock is called without
sock_net(sk)->sctp.addr_wq_lock then an element is removed from the
auto_asconf_splist list without any proper locking. This can be
exploited by a local user with network service privileges to escalate to
root or from the context of an unprivileged user directly if a
BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some
SCTP socket.
11) Use-after-free (CVE-ID: CVE-2021-23134)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in nfc sockets in the Linux Kernel. A local user with the CAP_NET_RAW capability can trigger use-after-free and escalate privileges on the system.
12) Information disclosure (CVE-ID: CVE-2021-31829)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output in the Linux kernel's eBPF verification code. A local user can insert eBPF instructions, use the eBPF verifier to abuse a spectre-like flaw and infer all system memory.
13) Race condition (CVE-ID: CVE-2021-32399)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition for removal of the HCI controller within net/bluetooth/hci_request.c in the Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
14) Use-after-free (CVE-ID: CVE-2021-33034)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error in net/bluetooth/hci_event.c when destroying an hci_chan. A local user can escalate privileges on the system.
15) Out-of-bounds read (CVE-ID: CVE-2021-3506)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in fs/f2fs/node.c in the f2fs module in the Linux kernel. A local user can trigger out-of-bounds read error and read internal kernel information or crash the system.
Remediation
Install update from vendor's website.