SB2017042852 - Fedora 24 update for kernel

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2017042852

SB2017042852 - Fedora 24 update for kernel

Published: April 28, 2017 Updated: April 24, 2025

Security Bulletin ID SB2017042852
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Security restrictions bypass (CVE-ID: CVE-2016-9604)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local attacker to write arbitrary files on the target system.

The weakness exists due to root can gain direct access to an internal keyring, such as '.dns_resolver' or '.builtin_trusted_keys' upstream, by joining it as its session keyring. A local attacker can bypass module signature verification by adding a new public key of its own devising to the keyring.

2) Heap-based buffer overflow (CVE-ID: CVE-2017-7477)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker on the local network execute arbitrary code on the target system.

The weakness exists due to heap-based buffer overflow in the skb_to_sgvec() function in the MACsec driver. A remote attacker can use a MAX_SKB_FRAGS+1 size in conjunction with the NETIF_F_FRAGLIST feature, trigger memory corruption and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability results in arbitrary code execution.

3) Information disclosure (CVE-ID: CVE-2017-7889)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local attacker to gain access to potentially sensitive information.

The weakness exists in the CONFIG_STRICT_DEVMEM protection mechanism due to an improper enforcement. A local attacker can read or write to kernel memory locations in the first megabyte and bypass slab-allocation access restrictions.

4) 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.

Remediation

Install update from vendor's website.

References