RHSA-2015:1769 - Security Advisory

Topic

Updated libunwind packages that fix one security issue are now available
for Red Hat Enterprise Linux OpenStack Platform 5.0 for Red Hat Enterprise
Linux 7.

Red Hat Product Security has rated this update as having Low security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

Description

Libunwind provides a C ABI to determine the call-chain of a program.

An off-by-one array indexing error was found in the libunwind API, which
could cause an error when reading untrusted binaries or dwarf debug info
data. Red Hat products do not call the API in this way; and it is unlikely
that any exploitable attack vector exists in current builds or supported
usage. (CVE-2015-3239)

This issue was discovered by Paolo Bonzini of Red Hat.

All users of libunwind are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat OpenStack 5.0 for RHEL 7 x86_64

Fixes

• BZ - 1232265 - CVE-2015-3239 libunwind: off-by-one in dwarf_to_unw_regnum()

CVEs

• CVE-2015-3239

References

• https://access.redhat.com/security/updates/classification/#low