Bug 1440080 (CVE-2017-5461) - CVE-2017-5461 nss: Write beyond bounds caused by bugs in Base64 de/encoding in nssb64d.c and nssb64e.c (MFSA 2017-10)
Summary: CVE-2017-5461 nss: Write beyond bounds caused by bugs in Base64 de/encoding i...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-5461
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1440081 1440082 1440083 1440085 1440095 1440591 1440592 1440593 1440594 1440595 1440596 1440597 1447567
Blocks: 1440097
TreeView+ depends on / blocked
 
Reported: 2017-04-07 09:28 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-02-17 02:22 UTC (History)
13 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An out-of-bounds write flaw was found in the way NSS performed certain Base64-decoding operations. An attacker could use this flaw to create a specially crafted certificate which, when parsed by NSS, could cause it to crash or execute arbitrary code, using the permissions of the user running an application compiled against the NSS library.
Clone Of:
Environment:
Last Closed: 2017-04-20 05:35:02 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1100 0 normal SHIPPED_LIVE Critical: nss and nss-util security update 2017-04-20 09:00:06 UTC
Red Hat Product Errata RHSA-2017:1101 0 normal SHIPPED_LIVE Critical: nss security update 2017-04-20 06:17:09 UTC
Red Hat Product Errata RHSA-2017:1102 0 normal SHIPPED_LIVE Critical: nss-util security update 2017-04-20 06:37:04 UTC
Red Hat Product Errata RHSA-2017:1103 0 normal SHIPPED_LIVE Critical: nss security update 2017-04-20 06:16:57 UTC

Description Huzaifa S. Sidhpurwala 2017-04-07 09:28:38 UTC 
An out-of-bounds write during Base64 decoding operation in the Network Security Services (NSS) library due to insufficient memory being allocated to the buffer. This results in a potentially exploitable crash. 


External Reference:

https://www.mozilla.org/en-US/security/advisories/mfsa2017-10/#CVE-2017-5461


Acknowledgements:

Name: the Mozilla project
Upstream: Ronald Crane
Comment 9 errata-xmlrpc 2017-04-20 02:17:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5.9 Long Life

Via RHSA-2017:1103 https://access.redhat.com/errata/RHSA-2017:1103
Comment 10 errata-xmlrpc 2017-04-20 02:17:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5 Extended Lifecycle Support

Via RHSA-2017:1101 https://access.redhat.com/errata/RHSA-2017:1101
Comment 11 errata-xmlrpc 2017-04-20 02:37:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.7 Extended Update Support
  Red Hat Enterprise Linux 7.2 Extended Update Support
  Red Hat Enterprise Linux 6.2 Advanced Update Support
  Red Hat Enterprise Linux 6.4 Advanced Update Support
  Red Hat Enterprise Linux 6.5 Advanced Update Support
  Red Hat Enterprise Linux 6.6 Advanced Update Support
  Red Hat Enterprise Linux 6.5 Telco Extended Update Support
  Red Hat Enterprise Linux 6.6 Telco Extended Update Support

Via RHSA-2017:1102 https://access.redhat.com/errata/RHSA-2017:1102
Comment 12 errata-xmlrpc 2017-04-20 05:00:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2017:1100 https://access.redhat.com/errata/RHSA-2017:1100
Comment 13 Huzaifa S. Sidhpurwala 2017-04-21 04:56:26 UTC 
Statement:

The security flaw exists in NSS library Base64 encoder/decoder code. Any application which uses NSS library to parse base64 encoded data could possibly be affected by the flaw. For example:

1. Servers compiled against NSS which parse untrusted certificates or any other base64 encoded data from its users.

2. Utilities like curl etc which use NSS to parse user provided base64 encoded certificates.

3. Applications like Firefox which use NSS to parse client-certificates before passing them to the web server.
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