[<prev] [next>] [day] [month] [year] [list]
Date: Mon, 26 Jun 2017 18:07:59 +1000
From: Wade Mealing <wmealing@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2017-7482 Linux kernel: krb5 ticket decode len check.
Gday,
David Howells has written a great description, so rather than reword what
he's written here is a quote directly from the git commit.
>From the patch notes:
---
When a kerberos 5 ticket is being decoded so that it can be loaded into
an
rxrpc-type key, there are several places in which the length of a
variable-length field is checked to make sure that it's not going to
overrun the available data - but the data is padded to the nearest
four-byte boundary and the code doesn't check for this extra. This
could
lead to the size-remaining variable wrapping and the data pointer going
over the end of the buffer.
Fix this by making the various variable-length data checks use the
padded
length.
---
>From what I can see, this could leak 3 bytes of memory to userspace or
possibly corrupt 3 bytes of memory,
Upstream fix
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f2f97656ada8d811d3c1bef503ced266fcd53a0
Red Hat Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7482
--
Wade Mealing
Product Security - Kernel, RHCE
Red Hat
<https://www.redhat.com>
wmealing@...hat.com
<https://red.ht/sig>
TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
