CVE-2017-1000371

Public Exploit

Description

The offset2lib patch as used by the Linux Kernel contains a vulnerability, if RLIMIT_STACK is set to RLIM_INFINITY and 1 Gigabyte of memory is allocated (the maximum under the 1/4 restriction) then the stack will be grown down to 0x80000000, and as the PIE binary is mapped above 0x80000000 the minimum distance between the end of the PIE binary's read-write segment and the start of the stack becomes small enough that the stack guard page can be jumped over by an attacker. This affects Linux Kernel version 4.11.5. This is a different issue than CVE-2017-1000370 and CVE-2017-1000365. This issue appears to be limited to i386 based systems.

7.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 2.13% Top 20%

Vendor Advisory debian.org

Affected: n/a n/a

References

Link	Tags
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt	third party advisory
http://www.securityfocus.com/bid/99131	third party advisory vdb entry
http://www.debian.org/security/2017/dsa-3981	third party advisory vendor advisory
https://www.exploit-db.com/exploits/42276/	third party advisory vdb entry exploit
https://www.exploit-db.com/exploits/42273/	third party advisory vdb entry exploit
https://access.redhat.com/security/cve/CVE-2017-1000371	third party advisory vdb entry

Frequently Asked Questions

What is the severity of CVE-2017-1000371?: CVE-2017-1000371 has been scored as a high severity vulnerability.
How to fix CVE-2017-1000371?: To fix CVE-2017-1000371, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-1000371 being actively exploited in the wild?: It is possible that CVE-2017-1000371 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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