Bug 1679889 (CVE-2019-8956)

Summary:	CVE-2019-8956 Kernel: SCTP: use-after-free while traversing list of endpoint associations
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, bhu, blc, bmasney, brdeoliv, dhoward, dvlasenk, fhrbata, hkrzesin, jforbes, jshortt, jstancek, kernel-mgr, mlangsdo, nmurray, ptalbert, rvrbovsk, walters
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free issue was found in the Linux kernel's SCTP implementation. The issue could occur while traversing a list of endpoint associations to send a message to all of them via SCTP_SENDALL process. A user/process could use this flaw to crash the kernel resulting in a denial of service or potentially escalate privileges on a system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-03-18 14:20:01 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1679890, 1679920, 1679921
Bug Blocks:	1679857

Description Prasad Pandit 2019-02-22 07:24:00 UTC

A use-after-free issue was found in the Linux kernel's SCTP implementation.
It could occur while traversing a list of endpoint associations to send
a message to all of them via SCTP_SENDALL process.

A user/process could use this flaw to crash the kernel resulting in DoS
or potentially escalate privileges on a system.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/ba59fb0273076637f0add4311faa990a5eec27c0

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2019/02/21/2
  -> https://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/

Comment 1 Prasad Pandit 2019-02-22 07:26:59 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1679890]

Comment 5 Justin M. Forbes 2019-02-22 14:04:06 UTC

This was fixed for Fedora with the 4.20.8 stable updates.

Comment 6 Eric Christensen 2019-02-27 15:44:45 UTC

Statement:

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2.