Bug 1659627 (CVE-2018-19661)

Summary:	CVE-2018-19661 libsndfile: buffer over-read in the function i2ulaw_array in ulaw.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mhlavink
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 03:19:10 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:	1659628, 1673083, 1673084
Bug Blocks:	1659634

Description Laura Pardo 2018-12-14 20:37:15 UTC

An issue was discovered in libsndfile 1.0.28. There is a buffer over-read in the function i2ulaw_array in ulaw.c that will lead to a denial of service. 

References:
https://github.com/erikd/libsndfile/issues/429

Comment 1 Laura Pardo 2018-12-14 20:37:35 UTC

Created libsndfile tracking bugs for this issue:

Affects: fedora-all [bug 1659628]

Comment 2 Riccardo Schirone 2019-02-06 15:58:45 UTC

Upstream patch:
https://github.com/erikd/libsndfile/commit/585cc28a93be27d6938f276af0011401b9f7c0ca

Comment 3 Riccardo Schirone 2019-02-06 16:04:10 UTC

Functions i2ulaw_array() in ulaw.c and i2alaw_array() in alaw.c use an attacker-controlled value to index a global array, however when the value is negative they get the opposite, which is undefined behaviour in case the original value is INT_MIN. Thus those functions could access some elements outside the limits of the ulaw_encode/alaw_encode buffers.