678496 – (CVE-2019-8956) Kernel: local privilege escalation due to use-after-free in "sctp_sendmsg()" (CVE-2019-8956)

Bug 678496 (CVE-2019-8956) - Kernel: local privilege escalation due to use-after-free in "sctp_sendmsg()" (CVE-2019-8956)

Summary: Kernel: local privilege escalation due to use-after-free in "sctp_sendmsg()" ...

Status:	RESOLVED FIXED

Alias:	CVE-2019-8956

Product:	Gentoo Security
Classification:	Unclassified
Component:	Kernel (show other bugs)
Hardware:	All Linux

Importance:	Normal normal (vote)
Assignee:	Gentoo Kernel Security

URL:	https://www.openwall.com/lists/oss-se...
Whiteboard:
Keywords:

Depends on:
Blocks:

Reported:	2019-02-21 13:35 UTC by Agostino Sarubbo
Modified:	2022-03-26 00:56 UTC (History)
CC List:	0 users

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Runtime testing required:	---

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Description Agostino Sarubbo gentoo-dev

2019-02-21 13:35:21 UTC

From ${URL} :

Secunia just announced this a local root in SCTP:

	https://secuniaresearch.flexerasoftware.com/secunia_research/2019-5/

There was a SCTP local root in the kernel due to a association list
corruption.

https://lore.kernel.org/netdev/20190201141522.GA20785@kroah.com/

In sctp_sendmesg(), when walking the list of endpoint associations, the
association can be dropped from the list, making the list corrupt.
Properly handle this by using list_for_each_entry_safe()

Fixes: 4910280503f3 ("sctp: add support for snd flag SCTP_SENDALL process in sendmsg")

This issue is in 4.17 up to 5.0rc6.

Comment 1 John Helmert III archtester

2022-03-26 00:56:30 UTC

Patch is in 4.19.21, 4.20.8, 5.0