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Category:   Application (Security)  >   libtASN1 Vendors:   gnutls.org
(Red Hat Issues Fix) libtASN1 Heap Over-read in _asn1_extract_der_octet() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1039035
SecurityTracker URL:  http://securitytracker.com/id/1039035
CVE Reference:   CVE-2015-3622   (Links to External Site)
Date:  Aug 1 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 4.5
Description:   A vulnerability was reported in libtASN1. A remote user can cause denial of service conditions on the target system.

A remote user can supply a specially crafted certificate to trigger a heap over-read in _asn1_extract_der_octet() and cause the target application to crash.

The vendor was notified on April 16, 2015.

The original advisory is available at:

https://blog.fuzzing-project.org/9-Heap-overflow-invalid-read-in-Libtasn1-TFPA-0052015.html

Hanno Bock reported this vulnerability.

Impact:   A remote user can cause the target application to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:1860

Vendor URL:  access.redhat.com/errata/RHSA-2017:1860 (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
May 5 2015 libtASN1 Heap Over-read in _asn1_extract_der_octet() Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2017:1860-01] Moderate: libtasn1 security, bug fix, and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: libtasn1 security, bug fix, and enhancement update
Advisory ID:       RHSA-2017:1860-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1860
Issue date:        2017-08-01
CVE Names:         CVE-2015-2806 CVE-2015-3622 
=====================================================================

1. Summary:

An update for libtasn1 is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

Libtasn1 is a library that provides Abstract Syntax Notation One (ASN.1, as
specified by the X.680 ITU-T recommendation) parsing and structures
management, and Distinguished Encoding Rules (DER, as per X.690) encoding
and decoding functions.

The following packages have been upgraded to a later upstream version:
libtasn1 (4.10). (BZ#1360639)

Security Fix(es):

* A heap-based buffer overflow flaw was found in the way the libtasn1
library decoded certain DER-encoded inputs. A specially crafted DER-encoded
input could cause an application using libtasn1 to perform an invalid read,
causing the application to crash. (CVE-2015-3622)

* A stack-based buffer overflow was found in the way libtasn1 decoded
certain DER encoded data. An attacker could use this flaw to crash an
application using the libtasn1 library. (CVE-2015-2806)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1207192 - CVE-2015-2806 libtasn1: stack overflow in asn1_der_decoding
1218141 - CVE-2015-3622 libtasn1: heap overflow flaw in _asn1_extract_der_octet()
1360639 - update to libtasn1 4.x branch

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
libtasn1-4.10-1.el7.src.rpm

x86_64:
libtasn1-4.10-1.el7.i686.rpm
libtasn1-4.10-1.el7.x86_64.rpm
libtasn1-debuginfo-4.10-1.el7.i686.rpm
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
libtasn1-debuginfo-4.10-1.el7.i686.rpm
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm
libtasn1-devel-4.10-1.el7.i686.rpm
libtasn1-devel-4.10-1.el7.x86_64.rpm
libtasn1-tools-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
libtasn1-4.10-1.el7.src.rpm

x86_64:
libtasn1-4.10-1.el7.i686.rpm
libtasn1-4.10-1.el7.x86_64.rpm
libtasn1-debuginfo-4.10-1.el7.i686.rpm
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
libtasn1-debuginfo-4.10-1.el7.i686.rpm
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm
libtasn1-devel-4.10-1.el7.i686.rpm
libtasn1-devel-4.10-1.el7.x86_64.rpm
libtasn1-tools-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libtasn1-4.10-1.el7.src.rpm

aarch64:
libtasn1-4.10-1.el7.aarch64.rpm
libtasn1-debuginfo-4.10-1.el7.aarch64.rpm
libtasn1-devel-4.10-1.el7.aarch64.rpm

ppc64:
libtasn1-4.10-1.el7.ppc.rpm
libtasn1-4.10-1.el7.ppc64.rpm
libtasn1-debuginfo-4.10-1.el7.ppc.rpm
libtasn1-debuginfo-4.10-1.el7.ppc64.rpm
libtasn1-devel-4.10-1.el7.ppc.rpm
libtasn1-devel-4.10-1.el7.ppc64.rpm

ppc64le:
libtasn1-4.10-1.el7.ppc64le.rpm
libtasn1-debuginfo-4.10-1.el7.ppc64le.rpm
libtasn1-devel-4.10-1.el7.ppc64le.rpm

s390x:
libtasn1-4.10-1.el7.s390.rpm
libtasn1-4.10-1.el7.s390x.rpm
libtasn1-debuginfo-4.10-1.el7.s390.rpm
libtasn1-debuginfo-4.10-1.el7.s390x.rpm
libtasn1-devel-4.10-1.el7.s390.rpm
libtasn1-devel-4.10-1.el7.s390x.rpm

x86_64:
libtasn1-4.10-1.el7.i686.rpm
libtasn1-4.10-1.el7.x86_64.rpm
libtasn1-debuginfo-4.10-1.el7.i686.rpm
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm
libtasn1-devel-4.10-1.el7.i686.rpm
libtasn1-devel-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
libtasn1-debuginfo-4.10-1.el7.aarch64.rpm
libtasn1-tools-4.10-1.el7.aarch64.rpm

ppc64:
libtasn1-debuginfo-4.10-1.el7.ppc64.rpm
libtasn1-tools-4.10-1.el7.ppc64.rpm

ppc64le:
libtasn1-debuginfo-4.10-1.el7.ppc64le.rpm
libtasn1-tools-4.10-1.el7.ppc64le.rpm

s390x:
libtasn1-debuginfo-4.10-1.el7.s390x.rpm
libtasn1-tools-4.10-1.el7.s390x.rpm

x86_64:
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm
libtasn1-tools-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libtasn1-4.10-1.el7.src.rpm

x86_64:
libtasn1-4.10-1.el7.i686.rpm
libtasn1-4.10-1.el7.x86_64.rpm
libtasn1-debuginfo-4.10-1.el7.i686.rpm
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm
libtasn1-devel-4.10-1.el7.i686.rpm
libtasn1-devel-4.10-1.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
libtasn1-debuginfo-4.10-1.el7.x86_64.rpm
libtasn1-tools-4.10-1.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-2806
https://access.redhat.com/security/cve/CVE-2015-3622
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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