CVE-2017-2671

MEDIUM

Description

The ping_unhash function in net/ipv4/ping.c in the Linux kernel through 4.10.8 is too late in obtaining a certain lock and consequently cannot ensure that disconnect function calls are safe, which allows local users to cause a denial of service (panic) by leveraging access to the protocol value of IPPROTO_ICMP in a socket system call.

References

http://openwall.com/lists/oss-security/2017/04/04/8

http://www.securityfocus.com/bid/97407

https://access.redhat.com/errata/RHSA-2017:1842

https://access.redhat.com/errata/RHSA-2017:2077

https://access.redhat.com/errata/RHSA-2017:2669

https://access.redhat.com/errata/RHSA-2018:1854

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/net/ipv4/ping.c?id=43a6684519ab0a6c52024b5e25322476cabad893

https://github.com/danieljiang0415/android_kernel_crash_poc

https://github.com/torvalds/linux/commit/43a6684519ab0a6c52024b5e25322476cabad893

https://twitter.com/danieljiang0415/status/845116665184497664

https://usn.ubuntu.com/3754-1/

https://www.exploit-db.com/exploits/42135/

Details

Source: MITRE

Published: 2017-04-05

Updated: 2018-08-24

Type: CWE-284

Risk Information

CVSS v2.0

Base Score: 4.9

Vector: (AV:L/AC:L/Au:N/C:N/I:N/A:C)

Impact Score: 6.9

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3.0

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM