Amazon Linux: Security Advisory (ALAS-2016-726)

# SPDX-FileCopyrightText: 2016 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.120715");
  script_cve_id("CVE-2016-1237", "CVE-2016-4470", "CVE-2016-5243", "CVE-2016-5244", "CVE-2016-5696");
  script_tag(name:"creation_date", value:"2016-10-26 12:38:17 +0000 (Wed, 26 Oct 2016)");
  script_version("2025-01-23T05:37:39+0000");
  script_tag(name:"last_modification", value:"2025-01-23 05:37:39 +0000 (Thu, 23 Jan 2025)");
  script_tag(name:"cvss_base", value:"5.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-04-22 17:48:00 +0000 (Mon, 22 Apr 2019)");

  script_name("Amazon Linux: Security Advisory (ALAS-2016-726)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("Amazon Linux Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/amazon_linux", "ssh/login/release");

  script_xref(name:"Advisory-ID", value:"ALAS-2016-726");
  script_xref(name:"URL", value:"https://alas.aws.amazon.com/ALAS-2016-726.html");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'kernel' package(s) announced via the ALAS-2016-726 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"It was found that nfsd is missing permissions check when setting ACL on files, this may allow a local users to gain access to any file by setting a crafted ACL. (CVE-2016-1237)

A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470)

A leak of information was possible when issuing a netlink command of the stack memory area leading up to this function call. An attacker could use this to determine stack information for use in a later exploit. (CVE-2016-5243)

A vulnerability was found in the Linux kernel in function rds_inc_info_copy of file net/rds/recv.c. The last field 'flags' of object 'minfo' is not initialized. This can leak data previously at the flags location to userspace. (CVE-2016-5244)

A flaw was found in the implementation of the Linux kernel's handling of networking challenge ack where an attacker is able to determine the shared counter which could be used to determine sequence numbers for TCP stream injection. (CVE-2016-5696)

(Updated on 2016-08-17: CVE-2016-5696 was fixed in this release but was not previously part of this errata)");

  script_tag(name:"affected", value:"'kernel' package(s) on Amazon Linux.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-rpm.inc");

release = rpm_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "AMAZON") {

  if(!isnull(res = isrpmvuln(pkg:"kernel", rpm:"kernel~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-debuginfo", rpm:"kernel-debuginfo~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-debuginfo-common-i686", rpm:"kernel-debuginfo-common-i686~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-debuginfo-common-x86_64", rpm:"kernel-debuginfo-common-x86_64~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-devel", rpm:"kernel-devel~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-doc", rpm:"kernel-doc~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-headers", rpm:"kernel-headers~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-tools", rpm:"kernel-tools~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-tools-debuginfo", rpm:"kernel-tools-debuginfo~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"kernel-tools-devel", rpm:"kernel-tools-devel~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"perf", rpm:"perf~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"perf-debuginfo", rpm:"perf-debuginfo~4.4.15~25.57.amzn1", rls:"AMAZON"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);