Bug 1663878 (CVE-2018-20030)

Summary:	CVE-2018-20030 libexif: Input validation issue resulting in a denial of service
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhughes, yselkowi
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:	2021-10-25 22:22:18 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:	1663879, 1673461, 1673462
Bug Blocks:	1663880

Description Andrej Nemec 2019-01-07 09:27:19 UTC

It was found that specially crafted XIF_IFD_INTEROPERABILITY and EXIF_IFD_EXIF tags could be used for a denial of service.

References:

https://seclists.org/bugtraq/2018/Dec/31

Comment 1 Andrej Nemec 2019-01-07 09:27:27 UTC

Created libexif tracking bugs for this issue:

Affects: fedora-all [bug 1663879]

Comment 2 Riccardo Schirone 2019-02-07 11:43:26 UTC

Upstream patch:
https://github.com/libexif/libexif/commit/6aa11df549114ebda520dde4cdaea2f9357b2c89

Comment 4 Riccardo Schirone 2019-02-07 14:53:11 UTC

External References:

https://seclists.org/bugtraq/2018/Dec/31

Comment 5 Riccardo Schirone 2019-02-07 15:00:40 UTC

Function exif_data_load_data_content() in exif-data.c recursively calls itself when EXIF_TAG_EXIF_IFD_POINTER, EXIF_TAG_INTEROPERABILITY_IFD_POINTER or EXIF_TAG_GPS_INFO_IFD_POINTER tags are found. A specially crafted file may abuse this recursion by making the program waste a lot of time on it.