Advisory
========

It was discovered that unshar from sharutils contained a heap buffer overflow flaw that could result in a Denial of Service attack when processing a shar archive if the archive contains overlong lines.

References
==========
https://bugzilla.redhat.com/show_bug.cgi?id=1548018
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/LSTLNKMVXDRS7L32VJ5TIEL4Q4PVSGNE/

Files
=====

Uploaded to core/update_testing:

sharutils-4.15.2-2.1.mga6

from sharutils-4.15.2-2.1.mga6.src.rpm

Assignee: smelror => qa-bugs
Whiteboard: MGA6TOO => (none)
Version: Cauldron => 6

Testing complete mga6 64

Before
------
$ echo "blah blah blah" >testfile

$ shar testfile > testfile.shar
shar: Saving testfile (text)

$ file testfile.shar
testfile.shar: shell archive text

$ rm testfile
rm: remove regular file 'testfile'? y

$ unshar testfile.shar
testfile.shar:
x - created lock directory _sh24030.
x - extracting testfile (text)
x - removed lock directory _sh24030.

$ cat testfile
blah blah blah


After
-----
$ rm testfile.shar
rm: remove regular file 'testfile.shar'? y

$ shar testfile > testfile.shar
shar: Saving testfile (text)

$ file testfile.shar
testfile.shar: shell archive text

$ rm testfile
rm: remove regular file 'testfile'? y

$ unshar testfile.shar
testfile.shar:
x - created lock directory _sh24838.
x - extracting testfile (text)
x - removed lock directory _sh24838.

$ cat testfile
blah blah blah

Whiteboard: (none) => mga6-64-ok
Keywords: (none) => has_procedure

Thanks Claire for the test. Validating it.

@David @Stig
The advisory has no CVE; it is uploaded as per comment 1. It can be added.
Done for Mageia 6 only, but comment 0
> Mageia 5 and Mageia 6 are also affected
makes this unsure. Unvalidate it quickly if you really do want both.

Keywords: (none) => advisory, validated_update
CC: (none) => sysadmin-bugs

Thanks.  Like with most other issues also affecting Mageia 5, I didn't consider the package important enough to push a build for Mageia 5.  I'm trying to mark the ones that really should be fixed on mga5 with MGA5TOO.  I still report in the Comment 0's that Mageia 5 is affected just to document that fact.

An update for this issue has been pushed to the Mageia Updates repository.

https://advisories.mageia.org/MGASA-2018-0174.html

Resolution: (none) => FIXED
Status: NEW => RESOLVED

Ubuntu has issued an advisory for this on March 22:
https://usn.ubuntu.com/3605-1/

It has CVE-2018-1000097.

Severity: normal => major
Summary: sharutils new heap buffer overflow security issue => sharutils new heap buffer overflow security issue (CVE-2018-1000097)