CVE-2017-1000371
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Linux Kernel (Debian 9/10 / Ubuntu 14.04.5/16.04.2/17.04 / Fedora 23/24/25) - 'ldso_dynamic Stack Clash' Local Privilege Escalation
Linux Kernel - 'offset2lib' Stack Clash
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| arch | fixed | 4.9.39-1 | |
| debian | bookworm | fixed | 4.11.11-1 |
| debian | bullseye | fixed | 4.11.11-1 |
| debian | forky | fixed | 4.11.11-1 |
| debian | sid | fixed | 4.11.11-1 |
| debian | trixie | fixed | 4.11.11-1 |
| linux-kernel | affected | 4.1.43 |
References
- http://www.debian.org/security/2017/dsa-3981
- http://www.securityfocus.com/bid/99131
- https://access.redhat.com/security/cve/CVE-2017-1000371
- https://www.exploit-db.com/exploits/42273/
- https://www.exploit-db.com/exploits/42276/
- https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
- https://www.suse.com/security/cve/CVE-2017-1000371.html
- https://security-tracker.debian.org/tracker/CVE-2017-1000371
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.