Multiple vulnerabilities in Linux kernel



Published: 2019-09-04 | Updated: 2020-07-17
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2019-18805
CVE-2019-15924
CWE-ID CWE-190
CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Integer overflow

EUVDB-ID: #VU30638

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18805

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.0.0 - 5.0.10

External links

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00039.html
http://access.redhat.com/errata/RHSA-2020:0740
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78
http://security.netapp.com/advisory/ntap-20191205-0001/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) NULL pointer dereference

EUVDB-ID: #VU30799

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-15924

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the Linux kernel before 5.0.11. fm10k_init_module in drivers/net/ethernet/intel/fm10k/fm10k_main.c has a NULL pointer dereference because there is no -ENOMEM upon an alloc_workqueue failure. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Update to version 5.0.11.

Vulnerable software versions

Linux kernel: 5.0.0 - 5.0.10

External links

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11
http://github.com/torvalds/linux/commit/01ca667133d019edc9f0a1f70a272447c84ec41f
http://lists.debian.org/debian-lts-announce/2019/09/msg00014.html
http://lists.debian.org/debian-lts-announce/2019/09/msg00015.html
http://security.netapp.com/advisory/ntap-20191004-0001/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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