PT-2017-3518 · Linux+3 · Linux Kernel+3

Andrey Konovalov · Published 2017-02-21 · Updated 2023-02-10 · CVE-2017-6347

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.10.1

Description The issue is related to the ip cmsg recv checksum function in the Linux kernel, which has incorrect expectations about skb data layout. This can be exploited by local users to cause a denial of service (buffer over-read) via crafted system calls. The exploitation can be demonstrated by using the MSG MORE flag in conjunction with loopback UDP transmission.

Recommendations For Linux kernel versions prior to 4.10.1, update to version 4.10.1 or later to resolve the issue. As a temporary workaround, consider restricting the use of the MSG MORE flag in conjunction with loopback UDP transmission to minimize the risk of exploitation.

Fix

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2017-1215

ALT-PU-2017-1216

BDU:2018-00379

CVE-2017-6347

MGASA-2017-0088

MGASA-2017-0089

MGASA-2017-0090

OPENSUSE-SU-2017_0906-1

OPENSUSE-SU-2017_0907-1

SUSE-SU-2017:1183-1

SUSE-SU-2017:1990-1

USN-3265-1

USN-3265-2

USN-3361-1

Affected Products

Alt Linux

Linux Kernel

Suse

Ubuntu

References · 469

• https://github.com/torvalds/linux/commit/ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 · Patch
• https://advisories.mageia.org/MGASA-2017-0090.html · Security Note
• https://ubuntu.com/security/notices/USN-3361-1 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1427984 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2017-6347 · Security Note
• http://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.1 · Patch
• https://ubuntu.com/security/CVE-2017-5546 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3265-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-2584 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-9755 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-2596 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-5986 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-9150 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2017-6347 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 · Patch