Debian: Security Advisory (DLA-2648-1)

# SPDX-FileCopyrightText: 2021 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("1.3.6.1.4.1.25623.1.0.892648");
  script_cve_id("CVE-2021-20270", "CVE-2021-27291", "CVE-2021-30152", "CVE-2021-30155", "CVE-2021-30158", "CVE-2021-30159");
  script_tag(name:"creation_date", value:"2021-05-06 03:01:47 +0000 (Thu, 06 May 2021)");
  script_version("2024-02-02T05:06:07+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:07 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-04-08 23:30:13 +0000 (Thu, 08 Apr 2021)");

  script_name("Debian: Security Advisory (DLA-2648-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Debian Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages", re:"ssh/login/release=DEB9");

  script_xref(name:"Advisory-ID", value:"DLA-2648-1");
  script_xref(name:"URL", value:"https://www.debian.org/lts/security/2021/DLA-2648-1");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/mediawiki");
  script_xref(name:"URL", value:"https://wiki.debian.org/LTS");

  script_tag(name:"summary", value:"The remote host is missing an update for the Debian 'mediawiki' package(s) announced via the DLA-2648-1 advisory.");

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

  script_tag(name:"insight", value:"Several vulnerabilities were discovered in mediawiki, a wiki website engine for collaborative work.

CVE-2021-20270

An infinite loop in SMLLexer in Pygments used by mediawiki as one if its lexers may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the exception keyword.

CVE-2021-27291

pygments, the lexers used by mediawiki rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

CVE-2021-30152

An issue was discovered in MediaWiki. When using the MediaWiki API to protect a page, a user is currently able to protect to a higher level than they currently have permissions for.

CVE-2021-30155

An issue was discovered in MediaWiki before. ContentModelChange does not check if a user has correct permissions to create and set the content model of a nonexistent page.

CVE-2021-30158

An issue was discovered in MediaWiki. Blocked users are unable to use Special:ResetTokens. This has security relevance because a blocked user might have accidentally shared a token, or might know that a token has been compromised, and yet is not able to block any potential future use of the token by an unauthorized party.

CVE-2021-30159

An issue was discovered in MediaWiki. Users can bypass intended restrictions on deleting pages in certain fast double move situations. MovePage::isValidMoveTarget() uses FOR UPDATE, but it's only called if Title::getArticleID() returns non-zero with no special flags. Next, MovePage::moveToInternal() will delete the page if getArticleID(READ_LATEST) is non-zero. Therefore, if the page is missing in the replica DB, isValidMove() will return true, and then moveToInternal() will unconditionally delete the page if it can be found in the master.

For Debian 9 stretch, these problems have been fixed in version 1:1.27.7-1~deb9u8.

We recommend that you upgrade your mediawiki packages.

For the detailed security status of mediawiki please refer to its security tracker page at: [link moved to references]

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references]");

  script_tag(name:"affected", value:"'mediawiki' package(s) on Debian 9.");

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

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod", value:"30");

  exit(0);
}

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

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

res = "";
report = "";

if(release == "DEB9") {

  if(!isnull(res = isdpkgvuln(pkg:"mediawiki", ver:"1:1.27.7-1~deb9u8", rls:"DEB9"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"mediawiki-classes", ver:"1:1.27.7-1~deb9u8", rls:"DEB9"))) {
    report += res;
  }

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

exit(0);