Huawei EulerOS: Security Advisory for rsyslog (EulerOS-SA-2019-2659)

# SPDX-FileCopyrightText: 2020 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("1.3.6.1.4.1.25623.1.1.2.2019.2659");
  script_cve_id("CVE-2019-17041", "CVE-2019-17042");
  script_tag(name:"creation_date", value:"2020-01-23 13:13:04 +0000 (Thu, 23 Jan 2020)");
  script_version("2024-02-05T14:36:56+0000");
  script_tag(name:"last_modification", value:"2024-02-05 14:36:56 +0000 (Mon, 05 Feb 2024)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-15 14:51:54 +0000 (Tue, 15 Oct 2019)");

  script_name("Huawei EulerOS: Security Advisory for rsyslog (EulerOS-SA-2019-2659)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Huawei EulerOS Local Security Checks");
  script_dependencies("gb_huawei_euleros_consolidation.nasl");
  script_mandatory_keys("ssh/login/euleros", "ssh/login/rpms", re:"ssh/login/release=EULEROS\-2\.0SP3");

  script_xref(name:"Advisory-ID", value:"EulerOS-SA-2019-2659");
  script_xref(name:"URL", value:"https://developer.huaweicloud.com/intl/en-us/euleros/securitydetail.html?secId=EulerOS-SA-2019-2659");

  script_tag(name:"summary", value:"The remote host is missing an update for the Huawei EulerOS 'rsyslog' package(s) announced via the EulerOS-SA-2019-2659 advisory.");

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

  script_tag(name:"insight", value:"An issue was discovered in Rsyslog v8.1908.0. contrib/pmaixforwardedfrom/pmaixforwardedfrom.c has a heap overflow in the parser for AIX log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon) but fails to account for strings that do not satisfy this constraint. If the string does not match, then the variable lenMsg will reach the value zero and will skip the sanity check that detects invalid log messages. The message will then be considered valid, and the parser will eat up the nonexistent colon delimiter. In doing so, it will decrement lenMsg, a signed integer, whose value was zero and now becomes minus one. The following step in the parser is to shift left the contents of the message. To do this, it will call memmove with the right pointers to the target and destination strings, but the lenMsg will now be interpreted as a huge value, causing a heap overflow.(CVE-2019-17041)

An issue was discovered in Rsyslog v8.1908.0. contrib/pmcisconames/pmcisconames.c has a heap overflow in the parser for Cisco log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon), but fails to account for strings that do not satisfy this constraint. If the string does not match, then the variable lenMsg will reach the value zero and will skip the sanity check that detects invalid log messages. The message will then be considered valid, and the parser will eat up the nonexistent colon delimiter. In doing so, it will decrement lenMsg, a signed integer, whose value was zero and now becomes minus one. The following step in the parser is to shift left the contents of the message. To do this, it will call memmove with the right pointers to the target and destination strings, but the lenMsg will now be interpreted as a huge value, causing a heap overflow.(CVE-2019-17042)");

  script_tag(name:"affected", value:"'rsyslog' package(s) on Huawei EulerOS V2.0SP3.");

  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 == "EULEROS-2.0SP3") {

  if(!isnull(res = isrpmvuln(pkg:"rsyslog", rpm:"rsyslog~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"rsyslog-gnutls", rpm:"rsyslog-gnutls~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"rsyslog-gssapi", rpm:"rsyslog-gssapi~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"rsyslog-mmjsonparse", rpm:"rsyslog-mmjsonparse~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"rsyslog-mysql", rpm:"rsyslog-mysql~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"rsyslog-pgsql", rpm:"rsyslog-pgsql~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"rsyslog-relp", rpm:"rsyslog-relp~7.4.7~7.2.h21", rls:"EULEROS-2.0SP3"))) {
    report += res;
  }

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

exit(0);