Bug 1872021 (CVE-2020-24659) - CVE-2020-24659 gnutls: Heap buffer overflow in handshake with no_renegotiation alert sent
Summary: CVE-2020-24659 gnutls: Heap buffer overflow in handshake with no_renegotiatio...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-24659
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1873959 1875862 1875863 1875864 1903038
Blocks: 1872022
TreeView+ depends on / blocked
 
Reported: 2020-08-24 21:01 UTC by Pedro Sampaio
Modified: 2021-02-16 19:26 UTC (History)
17 users (show)

Fixed In Version: gnutls 3.6.15
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in GnuTLS, where the server can trigger the client to run into heap buffer overflow if a no_renegotiation alert is sent in an unexpected timing. This flaw allows the client to crash at the session deinitialization timing. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2020-12-15 22:18:46 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:5483 0 None None None 2020-12-15 16:43:10 UTC

Description Pedro Sampaio 2020-08-24 21:01:37 UTC 
A flaw was found in Gnutls. The server can trigger the client to run into heap buffer overflow if a no_renegotiation alert is sent in an unexpected timing. That may cause the client to crash at the session deinitialization timing.

Upstream issue:

https://gitlab.com/gnutls/gnutls/-/issues/1071
Comment 2 Huzaifa S. Sidhpurwala 2020-08-31 08:06:19 UTC 
Acknowledgments:

Name: the GnuTLS project
Comment 3 Huzaifa S. Sidhpurwala 2020-08-31 10:14:02 UTC 
Statement:

This issue only affects TLS 1.3 implementation of GnuTLS which is available on GnuTLS 3.6.x branch. Therefore only GnuTLS packages shipped with Red Hat Enterprise Linux 8 are affected by this flaw.
Comment 4 Huzaifa S. Sidhpurwala 2020-09-04 14:59:15 UTC 
External References:

https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04
Comment 5 Huzaifa S. Sidhpurwala 2020-09-04 15:00:04 UTC 
Created gnutls tracking bugs for this issue:

Affects: fedora-all [bug 1875863]


Created gnutls30 tracking bugs for this issue:

Affects: epel-6 [bug 1875862]


Created mingw-gnutls tracking bugs for this issue:

Affects: fedora-all [bug 1875864]
Comment 6 Huzaifa S. Sidhpurwala 2020-10-26 15:28:37 UTC 
Reproducer: There is a reproducer available in the upstream bug at: https://gitlab.com/gnutls/gnutls/-/issues/1071 which works with ASAN builds.
Comment 7 errata-xmlrpc 2020-12-15 16:43:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:5483 https://access.redhat.com/errata/RHSA-2020:5483
Comment 8 Product Security DevOps Team 2020-12-15 22:18:46 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-24659
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