This file lists all significant changes made between the Owl 3.1 branch
point (off Owl-current) and the current state of the 3.1-stable branch.
The dates shown in braces indicate when an equivalent change went into Owl-current, where applicable. Note that although the 3.1 branch point was created in mid-2014, Owl 3.1 was never released (nor was it intended to be) and the Owl 3.1-stable branch was only released in January 2015.
Security fixes have a "Severity" specified for the issue(s) being fixed. The three comma-separated metrics given after "Severity:" are: risk impact (low, medium, or high), attack vector (local, remote, or indirect), and whether the attack may be carried out at will (active) or not (passive). Please note that the specified risk impact is just that, it is not the overall severity, so other metrics are not factored into it. For example, a "high" impact "local, passive" issue is generally of lower overall severity than a "high" impact "remote, active" one - this is left up to our users to consider given their specific circumstances.
Per our current conventions, a Denial of Service (DoS) vulnerability is generally considered to have a "low" risk impact (even if it is a "remote, active" one, which is to be considered separately as it may make the vulnerability fairly critical under specific circumstances). Some examples of "medium" impact vulnerabilities would be persistent DoS (where the DoS effect does not go away with a (sub)system restart), data loss, bugs enabling non-critical information leaks, cryptographic signature forgeries, and/or sending of or accepting spoofed/forged network traffic (where such behavior was unexpected), as long as they would not directly allow for a "high" impact attack. Finally, a typical "high" impact vulnerability would allow for privilege escalation such as ability to execute code as another user ID than the attacker's (a "local" attack) or without "legitimately" having such an ability (a "remote" attack).
The metrics specified are generally those for a worst case scenario, however in certain cases ranges such as "none to low" or/and "local to remote" may be specified, referring to the defaults vs. a worst case yet "legitimate" custom configuration. In some complicated cases, multiple issues or attacks may be dealt with at once. When those differ in their severity metrics, we use slashes to denote the possible combinations. For example, "low/none to high, remote/local" means that we've dealt with issue(s) or attack(s) that are "low, remote" and those that are "none to high, local". In those tricky cases, we generally try to clarify the specific issue(s) and their severities in the description.
Changes made between Owl 3.1 and Owl 3.1-stable.
(2020/05/19) 2020/05/20 Package: kernel SECURITY FIX Severity: high, local, active
Merged the most relevant fixes from RHEL5's -436, including for the
following local vulnerabilities: use-after-free in sys_mq_notify()
allowing for a local root compromise and container escape by any user
(CVE-2017-11176), divide-by-zero in __tcp_select_window() allowing for a
local DoS (CVE-2017-14106), use-after-free in ALSA allowing for a local
root compromise by a host user in group "audio" if the vulnerable kernel
module is loaded (CVE-2017-15265). Also fixed is an inconsistency in
modify_ldt(2)'s memory (de)allocation, which got introduced along with
KPTI in our update to -431 and is known as Red Hat's "bug 1584622" and
might have had local security impact.
(2018/07/03) 2018/07/03 Package: gnupg SECURITY FIX Severity: medium, local/indirect, passive
Updated to 1.4.23, which, compared to 1.4.21, fixes a side-channel leak
(CVE-2017-7526) and a bypass of signature verification in third-party
programs that invoke GnuPG (CVE-2018-12020).
(2018/06/28) 2018/07/03 Package: kernel
Fixed a regression introduced with the previous update (to -431) where some 32-bit syscalls would fail with EFAULT on a 64-bit kernel because of improper alignment of the newly introduced KAISER/KPTI trampoline stack. This fix is due to investigation and patch by Pavel Kankovsky and bug report by Chris Bopp.
(2018/05/23) 2018/05/23 Packages: procps, procps-ng SECURITY FIX Severity: high, local, passive
Replaced procps with procps-ng 3.3.14 plus all Qualys patches fixing a number
of issues that Qualys found during their security audit, including some issues
that might have allowed successful attacks on a user (or root) invoking top(1)
or other procps programs.
(2018/05/21) 2018/05/22 Package: kernel SECURITY FIX Severity: low to high, local, active
Updated to 2.6.18-431.el5.028stab123.1. This is a belated (with Owl
being barely on life support at this point) addition of kernel page
table isolation (KPTI) on x86-64 (only) as a software fix for Meltdown
(CVE-2017-5754) - an issue that allowed userspace processes to read
kernel memory (except on AMD CPUs). Also included is a fix for the "POP
SS" vulnerability (CVE-2018-8897), which allowed for a local DoS attack.
However, this update does not mitigate the set of CPU vulnerabilities
known as Spectre, although the exposure to them might be lower than it
is in newer kernels because of the lack of eBPF.
(2017/10/25) 2018/05/22 Package: glibc SECURITY FIX Severity: none to high, remote, active
Backported upstream fix for the recently discovered glob heap buffer
overflow (CVE-2017-15670) and while at it also for integer overflows in
pvalloc, valloc, posix_memalign/memalign/aligned_alloc (CVE-2013-4332).
(2017/10/19) 2017/10/21 Package: kernel SECURITY FIX Severity: none to high, local, active
Updated to 2.6.18-419.el5.028stab122.4. This addresses the issue of
Position Independent Executables' (PIE) data potentially overlapping in
memory with their stack areas (CVE-2017-1000253). (Un)fortunately, on
Owl we do not yet build our SUID/SGID binaries as PIE (which would be a
security enhancement if it were not for this issue), so this did not
affect Owl itself, but it could affect third-party SUID/SGID binaries
installed on Owl (including e.g. as part of third-party distros in
containers). The many other security issues also addressed with this
upstream update, as compared to the much older upstream revision we
built upon previously, had already been fixed or worked around in prior
kernel updates for Owl.
(2017/06/19) 2017/06/29 Package: kernel SECURITY FIX Severity: none to high, local, active
On SUID/SGID exec, limit the size of argv+envp to 512 KiB and the stack
size to 10 MiB, similarly to what grsecurity did in 2012. This prevents
some of the stack/heap clash attacks described by Qualys, while some
others were already prevented for years by our glibc hardening changes.
(2017/06/15) 2017/06/29 Package: db4 SECURITY FIX Severity: medium to high, local, active
Don't open the DB_CONFIG file in the current directory. This unexpected
property of db4 could have allowed for local DoS, information leaks, and
privilege escalation via programs using db4, including Postfix.
(2017/06/08) 2017/06/29 Package: kernel
Backported upstream reimplementation of restricted hard links,
controllable via the fs.protected_hardlinks sysctl and enabled by
default, similar to what we had as part of CONFIG_HARDEN_LINK in -ow
patches and what grsecurity had as part of CONFIG_GRKERNSEC_LINK. This
reinforces the group crontab vs. root privilege separation in our
package of ISC/Vixie Cron.
(2017/04/02) 2017/04/02 Package: kernel SECURITY FIX Severity: high, local, active
Merged upstream fix to locking in net/ipv4/ping.c: ping_unhash(), where
the race condition could have been exploited by container root into e.g.
container escape. Without a vulnerability in ping(1), the issue was not
triggerable by non-root users (neither host nor container).
(2017/01/25) 2017/01/25 Package: kernel SECURITY FIX Severity: high, local, active
Merged in a fix of use-after-free in the recvmmsg() exit path
(CVE-2016-7117) from Red Hat's -417. The vulnerability appears likely
to be exploitable locally. Remote exploitation might be possible as
well, but would require specific (unlikely?) behavior of a service.
(2016/12/10) 2016/12/11 Package: kernel
Merged in Red Hat's CVE-2016-5195 "Dirty COW" fix while also keeping the mitigation introduced in Owl earlier. In the kernel build for x86-64, bumped up the maximum number of logical CPUs from 32 to 96, enabled support for NUMA, huge pages, hugetlbfs, modules for I2C and many sensors (similar to what's enabled in RHEL) and CPU microcode update.
(2016/10/23) 2016/10/24 Package: kernel SECURITY FIX Severity: high, local, active
Added a mitigation for the "Dirty COW" Linux kernel privilege escalation
(2016/10/17 - 2016/10/21) 2016/10/24 Package: bind SECURITY FIX Severity: low, remote, active
Merged multiple DoS vulnerability fixes from Red Hat's package, most
notably for two easily triggerable assertion failures (CVE-2016-2776,
(2016/08/23) 2016/08/23 Package: openssh
Backported upstream fix for a use-after-free in sshd's debugging output, with no known security impact.
(2016/08/23) 2016/08/23 Package: openssl SECURITY FIX Severity: none to high, remote, active
Updated to 1.0.0t, which fixes the "X509_ATTRIBUTE memory leak"
(CVE-2015-3195) and "Race condition handling PSK identify hint"
(CVE-2015-3196) vulnerabilities. Neither of these affects the uses of
OpenSSL in Owl, but third-party applications using Owl's OpenSSL might
be affected. The "high" impact potential is for the double-free
possibility mentioned in the OpenSSL advisory, even though the OpenSSL
team has rated the corresponding issue as "low" overall severity
(possibly considering its low risk probability, or/and other mitigating
factors). This Owl package update also adds a CA certificate bundle.
(2016/08/23) 2016/08/23 Package: kernel SECURITY FIX Severity: low, local, active
Updated to 2.6.18-408.el5.028stab120.1, which addresses several DoS
vulnerabilities, and additionally fixed a kernel panic triggerable via
the move_pages() syscall.
(2016/08/23) 2016/08/23 Package: gnupg SECURITY FIX Severity: medium, remote, passive
Updated to 1.4.21, which, compared to 1.4.18, fixes side-channel leaks
(CVE-2014-3591, CVE-2015-0837) and a bug in the random number generator
where an attacker who obtains 4640 bits from the RNG could trivially
predict the next 160 bits of output (CVE-2016-6313).
(2016/07/20) 2016/08/23 Package: passwdqc
In version 1.3.1, fixed a bug in pam_passwdqc's rarely used "non-unix"
option. The bug existed since passwdqc 1.1.3, released in 2009.
(2015/02/24 - 2016/07/08) 2016/08/23 Package: john
The development changes in JtR, from version 188.8.131.52 to version 184.108.40.206, have now been included in Owl 3.1-stable because they include bug fixes.
(2015/08/01) 2015/08/01 Package: openssl SECURITY FIX Severity: none to medium, remote, passive to active
Updated to 1.0.0s, which fixes many Low and Moderate severity issues
(per OpenSSL's classification), as well as one High severity issue in
the client: silent downgrades of RSA to EXPORT_RSA (CVE-2015-0204), with
the corresponding attack known as FREAK.
(2015/07/31) 2015/07/31 Package: bind SECURITY FIX Severity: low, remote, active
Merged multiple DoS vulnerability fixes from Red Hat's package, most
notably for the easily triggerable error in handling of TKEY queries
(2015/06/11) 2015/06/11 Package: kernel SECURITY FIX Severity: high, local, active
Fixed OpenVZ container filesystem (simfs) escape vulnerability via bind
(2015/06/09) 2015/06/09 Package: kernel SECURITY FIX Severity: high, local, active
Updated to 2.6.18-406.el5.028stab119.1. Most importantly, this fixes a
possible I/O vector array overrun, which could allow for local privilege
(2015/01/28) 2015/01/28 Package: glibc SECURITY FIX Severity: none to high, remote, active
Backported upstream's fix for a buffer overflow in gethostbyname*()
functions, which could be triggered via a crafted IP address argument.
Depending on the application that uses these functions, this
vulnerability could allow a local or a remote attacker to execute
arbitrary code. Due to the analysis by Qualys (referenced below), it is
known that the issue could be exploited remotely via Exim (which we do
not include in Owl) or locally via clockdiff or procmail if these are
installed SUID/SGID or with filesystem capabilities (not the case on
Owl). While there's no known security impact on Owl itself, Owl with
third-party software added (as many real-world installs have) may be
affected, with worst-case impact ranging up to a remote root compromise.
(2015/01/04) 2015/01/04 Package: openssl SECURITY FIX Severity: none to medium, remote, active
Updated to 1.0.0o, which fixes "Information leak in pretty printing
functions" (CVE-2014-3508), "Race condition in
ssl_parse_serverhello_tlsext" (CVE-2014-3509), "Session Ticket Memory
Leak" (CVE-2014-3567), and adds support for "SSL 3.0 Fallback
protection" to let applications mitigate POODLE (CVE-2014-3566).
(2015/01/04) 2015/01/04 Package: bash
Updated to 3.1 patchlevel 23.
(2015/01/04) 2015/01/04 Package: help2man
New package: help2man, which creates simple man pages from the output of programs. It currently generates the diff(1) man page during Owl build.
(2014/12/28) 2015/01/03 Package: kernel SECURITY FIX Severity: none to high, local, active
Updated to 2.6.18-400.el5.028stab117.2, which most importantly fixes a
local privilege escalation vulnerability on x86-64 (CVE-2014-9322).
(2014/10/25) 2015/01/03 Package: tzdata
Updated to 2014i.
(2014/09/25 - 2014/09/27) 2015/01/03 Package: bash SECURITY FIX Severity: none to high, remote, active
Updated to 3.1 patchlevel 19 with additional patches by Florian Weimer
of Red Hat. This fixes vulnerabilities with and introduces security
hardening of function imports, which could in many setups be exploited
$Owl: Owl/doc/CHANGES-3.1-stable,v 220.127.116.11 2020/05/20 14:30:06 solar Exp $