CVE-2017-2671

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.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Exploits

Exploit-DB

• EDB-42135 · dos · android

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/
• https://www.suse.com/security/cve/CVE-2017-2671.html
• https://security-tracker.debian.org/tracker/CVE-2017-2671