Bug 1572058 – CVE-2018-10195 lrzsz: Integer overflow in src/zm.c:zsdata() causes crash in sz and can leak information to receiver

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Bug 1572058 - (CVE-2018-10195) CVE-2018-10195 lrzsz: Integer overflow in src/zm.c:zsdata() causes crash in sz and can leak information to receiver

Summary:	CVE-2018-10195 lrzsz: Integer overflow in src/zm.c:zsdata() causes crash in s...

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-10195

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=moderate,public=20180418,repor...
Keywords:	Security

Depends On:	1572059 1572060
Blocks:	1572061
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Reported:	2018-04-26 02:03 EDT by Sam Fowler
Modified:	2018-04-27 05:34 EDT (History)
CC List:	1 user (show)

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Last Closed:	2018-04-27 05:34:09 EDT
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Description Sam Fowler 2018-04-26 02:03:46 EDT

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 02:04:08 EDT

Created lrzsz tracking bugs for this issue:

Affects: fedora-all [bug 1572059]

Comment 3 Miroslav Lichvar 2018-04-26 09:56:17 EDT

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 01:38:53 EDT

(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 05:34:18 EDT

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.

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