oss-sec mailing list archives

Re: CVE request - Linux kernel - Fix handling of stored error in a negatively instantiated user key

From: cve-assign () mitre org
Date: Thu, 10 Dec 2015 01:19:34 -0500 (EST)

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A malicious user with a local account may be able to escalate privileges
and take control of local system by abusing the user key subsystem.

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=096fe9eaea40a17e125569f9e657e34cdb6d73bd
https://bugzilla.redhat.com/show_bug.cgi?id=1284450

The following may be used to trigger the bug in the user key type:

  keyctl request2 user user "" @u
  keyctl add user user "a" @u

BUG: unable to handle kernel paging request at 00000000ffffff8a

A similar bug can be tripped by:

  keyctl request2 trusted user "" @u
  keyctl add trusted user "a" @u

This should also affect encrypted keys


Use CVE-2015-8539 for all of the mentioned variants of the problem
with all key types.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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Current thread:

CVE request - Linux kernel - Fix handling of stored error in a negatively instantiated user key Wade Mealing (Dec 08)
- CVE request - Linux kernel - Fix handling of stored error in a negatively instantiated user key xiaoqixue_1 (Dec 09)
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    - Re: CVE request - a out of bound read bug is found in libdwarf cve-assign (Dec 09)
    - CVE request - read underflow in libpng 1.2.55, 1.0.65, 1.4.18, and 1.5.25 (pngwutil.c) xiaoqixue_1 (Dec 10)
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    - Re: CVE request - read underflow in libpng 1.2.55, 1.0.65, 1.4.18, and 1.5.25 (pngwutil.c) Glenn Randers-Pehrson (Dec 17)
    - Re: CVE request - read underflow in libpng 1.2.55, 1.0.65, 1.4.18, and 1.5.25 (pngwutil.c) cve-assign (Dec 11)
    - Re: Re: CVE request - read underflow in libpng 1.2.55, 1.0.65, 1.4.18, and 1.5.25 (pngwutil.c) Glenn Randers-Pehrson (Dec 11)
- Re: CVE request - Linux kernel - Fix handling of stored error in a negatively instantiated user key cve-assign (Dec 09)