Security fix for CVE-2017-2625

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update is now available for Red Hat Enterprise Linux 7.

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

The X11 (Xorg) libraries provide library routines that are used within all X Window applications.

The following packages have been upgraded to a later upstream version:
libX11 (1.6.5), libXaw (1.0.13), libXdmcp (1.1.2), libXfixes (5.0.3), libXfont (1.5.2), libXi (1.7.9), libXpm (3.5.12), libXrandr (1.5.1), libXrender (0.9.10), libXt (1.1.5), libXtst (1.2.3), libXv (1.0.11), libXvMC (1.0.10), libXxf86vm (1.1.4), libdrm (2.4.74), libepoxy (1.3.1), libevdev (1.5.6), libfontenc (1.1.3), libvdpau (1.1.1), libwacom (0.24), libxcb (1.12), libxkbfile (1.0.9), mesa (17.0.1), mesa-private-llvm (3.9.1), xcb-proto (1.12), xkeyboard-config (2.20), xorg-x11-proto-devel (7.7). (BZ#1401667, BZ#1401668, BZ#1401669, BZ#1401670, BZ#1401671, BZ#1401672, BZ#1401673, BZ#1401675, BZ# 1401676, BZ#1401677, BZ#1401678, BZ#1401679, BZ#1401680, BZ#1401681, BZ# 1401682, BZ#1401683, BZ#1401685, BZ#1401690, BZ#1401752, BZ#1401753, BZ# 1401754, BZ#1402560, BZ#1410477, BZ#1411390, BZ#1411392, BZ#1411393, BZ# 1411452, BZ#1420224)

Security Fix(es) :

* An integer overflow flaw leading to a heap-based buffer overflow was found in libXpm. An attacker could use this flaw to crash an application using libXpm via a specially crafted XPM file.
(CVE-2016-10164)

* It was discovered that libXdmcp used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users' sessions.
(CVE-2017-2625)

* It was discovered that libICE used a weak entropy to generate keys.
A local attacker could potentially use this flaw for session hijacking using the information available from the process list. (CVE-2017-2626)

Red Hat would like to thank Eric Sesterhenn (X41 D-Sec GmbH) for reporting CVE-2017-2625 and CVE-2017-2626.

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

This update for libXdmcp fixes the following issues :

  - CVE-2017-2625: The generation of session key in XDM     using libXdmcp might have used weak entropy, making the     session keys predictable (bsc#1025046)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for xorg-x11-libXdmcp fixes the following issues :

  - CVE-2017-2625: The generation of session key in XDM     using libXdmcp might have used weak entropy, making the     session keys predictable (bsc#1025046)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201704-03 (X.Org: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in X.Org server and       libraries. Please review the CVE identifiers referenced below for       details.
  Impact :

    A local or remote users can utilize the vulnerabilities to attach to the       X.Org session as a user and execute arbitrary code.
  Workaround :

    There is no known workaround at this time.

ID	名稱	產品	系列	已發布	已更新	嚴重性
97538	Fedora 24 : libXdmcp (2017-bcb1999e65)	Nessus	Fedora Local Security Checks	2017/3/6	2025/12/30	medium
102147	RHEL 7 : X.org X11 libraries (RHSA-2017:1865)	Nessus	Red Hat Local Security Checks	2017/8/3	2025/12/4	critical
101766	SUSE SLED12 / SLES12 Security Update : libXdmcp (SUSE-SU-2017:1862-1)	Nessus	SuSE Local Security Checks	2017/7/17	2025/12/10	medium
101767	SUSE SLES11 Security Update : xorg-x11-libXdmcp (SUSE-SU-2017:1868-1)	Nessus	SuSE Local Security Checks	2017/7/17	2025/12/10	medium
99276	GLSA-201704-03 : X.Org: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2017/4/11	2025/12/26	critical

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