Bug 580187 (CVE-2010-0826)

Summary: CVE-2010-0826 nss_db: Information leak due the DB_CONFIG file read from current working directory
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: nalin
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
URL: https://bugs.launchpad.net/ubuntu/+source/libnss-db/+bug/531976
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-06-25 09:53:56 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 580191, 580192, 580539, 580540, 580541, 580542, 580543, 833945    
Bug Blocks:    
Attachments:
Description Flags
Local extracted copy of "200-set-db-environment.dpatch"
none
Ubuntu patch none

Description Jan Lieskovsky 2010-04-07 16:52:05 UTC 
Common Vulnerabilities and Exposures assigned an identifier CVE-2010-0826 to
the following vulnerability:

The Free Software Foundation (FSF) Berkeley DB NSS module (aka
libnss-db) 2.2.3pre1 reads the DB_CONFIG file in the current working
directory, which allows local users to obtain sensitive information
via a symlink attack involving a setgid or setuid application that
uses this module.

References:
  [1] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0826
  [2] https://bugs.launchpad.net/ubuntu/+source/libnss-db/+bug/531976
  [3] http://www.ubuntu.com/usn/USN-922-1
  [4] http://www.securityfocus.com/bid/39132
  [5] http://secunia.com/advisories/39165
  [6] http://www.vupen.com/english/advisories/2010/0776

Patch applied by Ubuntu Linux vendor:
  [7] http://security.ubuntu.com/ubuntu/pool/main/libn/libnss-db/libnss-db_2.2
.3pre1-3ubuntu1.8.04.2.diff.gz
Comment 1 Jan Lieskovsky 2010-04-07 16:59:58 UTC 
Created attachment 405029 [details]
Local extracted copy of "200-set-db-environment.dpatch"
Comment 2 Jan Lieskovsky 2010-04-07 17:02:24 UTC 
This issue affects the versions of the nss_db package,
as shipped with Red Hat Enterprise Linux 3, 4, and 5.

This issue affects the versions of the nss_db package,
as shipped with Fedora release of 11 and 12.
Comment 5 Fedora Update System 2010-04-07 18:17:05 UTC 
nss_db-2.2-47.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/nss_db-2.2-47.fc12
Comment 6 Fedora Update System 2010-04-07 18:17:11 UTC 
nss_db-2.2-46.fc11 has been submitted as an update for Fedora 11.
http://admin.fedoraproject.org/updates/nss_db-2.2-46.fc11
Comment 7 Fedora Update System 2010-04-07 18:17:17 UTC 
nss_db-2.2.3-0.3.pre1.fc13 has been submitted as an update for Fedora 13.
http://admin.fedoraproject.org/updates/nss_db-2.2.3-0.3.pre1.fc13
Comment 10 Fedora Update System 2010-04-09 04:02:34 UTC 
nss_db-2.2.3-0.3.pre1.fc13 has been pushed to the Fedora 13 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 11 Tomas Hoger 2010-04-09 06:39:55 UTC 
Created attachment 405473 [details]
Ubuntu patch

Same thing as comment #1, just throw away unneeded dpatch wrapper and only leave the real patch.
Comment 12 Tomas Hoger 2010-04-12 15:59:46 UTC 
(In reply to comment #2)
> This issue affects the versions of the nss_db package,
> as shipped with Red Hat Enterprise Linux 3, 4, and 5.

Further investigation of this issue showed that nss_db packages in Red Hat Enterprise Linux 3 and 4 are not affected, as Berkeley DB versions they use do not attempt to use current working directory as a path to database environment.

In Red Hat Enterprise Linux 5, current working directory is used as database environment, which causes nss_db to attempt to use certain files (such as DB_CONFIG or __db.*) from current working directory of the program.
Comment 13 errata-xmlrpc 2010-04-13 21:21:07 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2010:0347 https://rhn.redhat.com/errata/RHSA-2010-0347.html
Comment 14 Fedora Update System 2010-05-06 03:41:27 UTC 
nss_db-2.2-47.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 15 Fedora Update System 2010-05-06 03:45:30 UTC 
nss_db-2.2-46.fc11 has been pushed to the Fedora 11 stable repository.  If problems still persist, please make note of it in this bug report.