Bug 1572058 (CVE-2018-10195)

Summary:	CVE-2018-10195 lrzsz: Integer overflow in src/zm.c:zsdata() causes crash in sz and can leak information to receiver
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mlichvar
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:	2018-04-27 09:34:09 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:	1572059, 1572060
Bug Blocks:	1572061

Description Sam Fowler 2018-04-26 06:03:46 UTC

Lrzsz has an integer overflow vulernability in the src/zm.c:zsdata() function. An attacker could exploit this with the sz command to cause a crash or potentially leak information to the receiving server.


Additional References:

https://bugzilla.novell.com/show_bug.cgi?id=1090051

Comment 1 Sam Fowler 2018-04-26 06:04:08 UTC

Created lrzsz tracking bugs for this issue:

Affects: fedora-all [bug 1572059]

Comment 3 Miroslav Lichvar 2018-04-26 13:56:17 UTC

Does this affect our packages?

We have the following patch (added for bug #75473), which fixes the zsdata() function to handle a length of zero:
https://src.fedoraproject.org/cgit/rpms/lrzsz.git/tree/lrzsz-0.12.20.patch

The changelog of the SUSE package indicates it was fixed in the 0.12.21rc version, but that seems to be a different bug, which is related to zero-length files and mmap().

Comment 4 Sam Fowler 2018-04-27 05:38:53 UTC

(In reply to Miroslav Lichvar from comment #3)
> Does this affect our packages?
> 
> We have the following patch (added for bug #75473), which fixes the zsdata()
> function to handle a length of zero:
> https://src.fedoraproject.org/cgit/rpms/lrzsz.git/tree/lrzsz-0.12.20.patch
> 
> The changelog of the SUSE package indicates it was fixed in the 0.12.21rc
> version, but that seems to be a different bug, which is related to
> zero-length files and mmap().

I overlooked the patch, so I think you are correct and our packages are not affected. Happy for this bug and it's trackers to be closed as NOTABUG.

Comment 5 Cedric Buissart 2018-04-27 09:34:18 UTC

Statement:

This issue did not affect the versions of lrzsz as shipped with Red Hat Enterprise Linux 5, 6, and 7. A patch was already applied for this vulnerability.