Bug 1740464 (CVE-2019-14274)

Summary:	CVE-2019-14274 mcpp: heap based buffer overflow in function do_msg() in support.c
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	kmatsui, mefoster, pfrankli
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 10:47:54 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:	1740465, 1743382
Bug Blocks:	1740467

Description Dhananjay Arunesh 2019-08-13 04:44:49 UTC

A vulnerability was found in MCPP 2.7.2 has a heap-based buffer overflow in the do_msg() function in
support.c.

Reference:
https://sourceforge.net/p/mcpp/bugs/13/

Comment 1 Dhananjay Arunesh 2019-08-13 04:45:04 UTC

Created mcpp tracking bugs for this issue:

Affects: fedora-all [bug 1740465]

Comment 3 Marco Benatto 2019-08-19 15:49:34 UTC

External References:

https://sourceforge.net/p/mcpp/bugs/13/

Comment 6 Marco Benatto 2019-08-19 19:01:40 UTC

When mcpp application found multibyte characters when parsing the input file, it tries to show warning messages. The messages are shown via cwarn() function which further calls do_msg() with the error message itself formatted in printf-like format. The buffer containing the multibyte sequence is also passed as parameter for do_msg() which doesn't handle it gracefully. This causes a buffer overflow to happening during the output message formation, the overflow may cause low integrity and confidentiality impacts and eventually may lead to invalid memory access causing DoS.