Bug 1663906 (CVE-2018-1000886)

Summary:	CVE-2018-1000886 nasm: Buffer overflow in asm/stdscan.c:130 resulting in a denial of service
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	ASSIGNED ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	dominik, java-sig-commits, mizdebsk, nickc
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1663909, 1671491, 1671492
Bug Blocks:	1663910

Description Andrej Nemec 2019-01-07 09:52:11 UTC

A buffer overflow vulnerability was found in nasm. A specially crafted file could trigger endless macro generation and cause the application to crash.

Upstream issue:

https://bugzilla.nasm.us/show_bug.cgi?id=3392514

Comment 1 Andrej Nemec 2019-01-07 09:54:56 UTC

Created nasm tracking bugs for this issue:

Affects: fedora-all [bug 1663909]

Comment 2 Nick Clifton 2019-01-17 10:36:22 UTC

Setting devel cond nak - waiting on 2.15 release upstream.

Comment 3 Scott Gayou 2019-01-29 16:10:52 UTC

Yep. Simple segfault / denial of service. Reproducible in Red Hat Enterprise 7. Unable to reproduce on Red Hat Enterprise 5 and 6.

```
$ time nasm poc
...
poc:14: error: macro call expects terminating `)'
poc:14: error: macro call expects terminating `)'
poc:14: error: macro call expects terminating `)'
poc:14: error: interminable macro recursion
Segmentation fault

real	1m24.913s

Very low impact.