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.

It has been found, that libxdmcp, an X11 Display Manager Control Protocol library, uses weak entropy to generate keys.

Using arc4random_buf() from libbsd should avoid this flaw.

For Debian 8 'Jessie', this problem has been fixed in version 1:1.1.1-1+deb8u1.

We recommend that you upgrade your libxdmcp packages.

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - It was discovered that libXdmcp before 1.1.2 including 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-5690-1 advisory.

    It was discovered that libXdmcp was generating weak session keys. A local attacker could possibly use this     issue to perform a brute force attack and obtain another user's key.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-1865 advisory.

    - Use libbsd for randoms (CVE-2017-2626, rhbz#1427715)
    - Use libbsd for randoms (CVE-2017-2625, rhbz#1427716)
    - fixes CVE-2016-5407
    - fixes CVE-2016-7953

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libXpm, libXdmcp, libICE packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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)

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

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2017-2024:01 advisory.

    * 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)     CVE-2016-10164     Multiple integer overflows in libXpm before 3.5.12, when a program     requests parsing XPM extensions on a 64-bit platform, allow remote     attackers to cause a denial of service (out-of-bounds write) or     execute arbitrary code via (1) the number of extensions or (2) their     concatenated length in a crafted XPM file, which triggers a heap-based     buffer overflow.
    CVE-2017-2625
    ** RESERVED **     This candidate has been reserved by an organization or individual that     will use it when announcing a new security problem.  When the     candidate has been publicized, the details for this candidate will be     provided.
    CVE-2017-2626
    ** RESERVED **     This candidate has been reserved by an organization or individual that     will use it when announcing a new security problem.  When the     candidate has been publicized, the details for this candidate will be     provided.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
102147	RHEL 7 : X.org X11 libraries (RHSA-2017:1865)	Nessus	Red Hat Local Security Checks	2017/8/3	2025/12/4	critical
131291	Debian DLA-2006-1 : libxdmcp security update	Nessus	Debian Local Security Checks	2019/11/26	2024/4/9	medium
221085	Linux Distros Unpatched Vulnerability : CVE-2017-2625	Nessus	Misc.	2025/3/4	2025/9/3	medium
166261	Ubuntu 16.04 ESM : libXdmcp vulnerability (USN-5690-1)	Nessus	Ubuntu Local Security Checks	2022/10/19	2024/8/28	medium
102340	Oracle Linux 7 : X.org / X11 / libraries (ELSA-2017-1865)	Nessus	Oracle Linux Local Security Checks	2017/8/10	2025/12/2	critical
102740	CentOS 7 : libICE / libX11 / libXaw / libXcursor / libXdmcp / libXfixes / libXfont / libXfont2 / etc (CESA-2017:1865)	Nessus	CentOS Local Security Checks	2017/8/25	2025/11/25	critical
103070	EulerOS 2.0 SP2 : libXpm, libXdmcp, libICE (EulerOS-SA-2017-1212)	Nessus	Huawei Local Security Checks	2017/9/11	2025/11/24	critical
289337	MiracleLinux 7 : X.org X11 libraries security, bug fix and enhancement update (AXSA:2017-2024:01)	Nessus	Miracle Linux Local Security Checks	2026/1/16	2026/1/16	critical
101569	Fedora 26 : libXdmcp (2017-09f65e5e00)	Nessus	Fedora Local Security Checks	2017/7/17	2025/12/10	medium

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