set_file_metadata in xattr.c in GNU Wget before 1.20.1 stores a file's origin URL in the user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this attribute, as demonstrated by getfattr. This also applies to Referer information in the user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog, user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2023:0139 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

      CVE-2018-20483:
      set_file_metadata in xattr.c in GNU Wget before 1.20.1 stores a file's origin URL in the     user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows     local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this     attribute, as demonstrated by getfattr. This also applies to Referer information in the     user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog,     user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.

Tenable has extracted the preceding description block directly from the Tencent Linux 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - set_file_metadata in xattr.c in GNU Wget before 1.20.1 stores a file's origin URL in the     user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows     local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this     attribute, as demonstrated by getfattr. This also applies to Referer information in the     user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog,     user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.
    (CVE-2018-20483)

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

An update of the wget package has been released.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-3701 advisory.

    - fix SMTP end-of-response out-of-bounds read (CVE-2019-3823)
    - fix NTLMv2 type-3 header stack buffer overflow (CVE-2019-3822)
    - fix NTLM type-2 out-of-bounds buffer read (CVE-2018-16890)
    - xattr: strip credentials from any URL that is stored (CVE-2018-20483)

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.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2019:3701 advisory.

  - curl: NTLM type-2 heap out-of-bounds buffer read (CVE-2018-16890)

  - wget: Information exposure in set_file_metadata function in xattr.c (CVE-2018-20483)

  - curl: NTLMv2 type-3 header stack buffer overflow (CVE-2019-3822)

  - curl: SMTP end-of-response out-of-bounds read (CVE-2019-3823)

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:3701 advisory.

    The curl packages provide the libcurl library and the curl utility for downloading files from servers     using various protocols, including HTTP, FTP, and LDAP.

    Security Fix(es):

    * curl: NTLM type-2 heap out-of-bounds buffer read (CVE-2018-16890)

    * wget: Information exposure in set_file_metadata function in xattr.c (CVE-2018-20483)

    * curl: NTLMv2 type-3 header stack buffer overflow (CVE-2019-3822)

    * curl: SMTP end-of-response out-of-bounds read (CVE-2019-3823)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.1 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 version of the wget package installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - set_file_metadata in xattr.c in GNU Wget before 1.20.1     stores a file's origin URL in the user.xdg.origin.url     metadata attribute of the extended attributes of the     downloaded file, which allows local users to obtain     sensitive information (e.g., credentials contained in     the URL) by reading this attribute, as demonstrated by     getfattr. This also applies to Referer information in     the user.xdg.referrer.url metadata attribute. According     to 2016-07-22 in the Wget ChangeLog,     user.xdg.origin.url was partially based on the behavior     of fwrite_xattr in tool_xattr.c in     curl.(CVE-2018-20483)

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.

Gynvael Coldwind reports :

set_file_metadata in xattr.c in GNU Wget before 1.20.1 stores a file's origin URL in the user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this attribute, as demonstrated by getfattr. This also applies to Referer information in the user.xdg.referrer.url metadata attribute.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3943-1 advisory.

    It was discovered that Wget incorrectly handled certain inputs. An attacker could possibly use this issue     to access sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10.
    (CVE-2018-20483)

    Kusano Kazuhiko discovered that Wget incorrectly handled certain inputs. An attacker could possibly use     this issue to execute arbitrary code. (CVE-2019-5953)

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

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

The remote host is affected by the vulnerability described in GLSA-201903-08 (GNU Wget: Password and metadata leak)

    A vulnerability was discovered in GNU Wget&rsquo;s file_metadata in xattr.c.
  Impact :

    A local attacker could obtain sensitive information to include       credentials.
  Workaround :

    There is no known workaround at this time.

libcurl is vulnerable to a heap buffer out-of-bounds read. The function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly and is subject to an integer overflow vulnerability. Using that overflow, a malicious or broken NTLM server could trick libcurl to accept a bad length + offset combination that would lead to a buffer read out-of-bounds.(CVE-2018-16890)

The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer overflow and resultant buffer overflow, and application crash) or possibly have unspecified other impact via vectors involving long user and password fields.(CVE-2017-8816)

curl and libcurl before 7.57.0 on 32-bit platforms allow attackers to cause a denial of service (out-of-bounds access and application crash) or possibly have unspecified other impact because too little memory is allocated for interfacing to an SSL library.(CVE-2017-8818)

libcurl may read outside of a heap allocated buffer when doing FTP.
When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote.(CVE-2017-1000254)

Curl versions 7.14.1 through 7.61.1 are vulnerable to a heap-based buffer over-read in the tool_msgs.c:voutf() function that may result in information exposure and denial of service.(CVE-2018-16842)

libcurl is vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data.
The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.(CVE-2019-3822)

libcurl is vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.(CVE-2019-3823)

The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) or possibly have unspecified other impact via a string that ends with an '[' character.(CVE-2017-8817)

set_file_metadata in xattr.c in GNU Wget before 1.20.1 stores a file's origin URL in the user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this attribute, as demonstrated by getfattr. This also applies to Referer information in the user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog, user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.(CVE-2018-20483)

A buffer overrun flaw was found in the IMAP handler of libcurl. By tricking an unsuspecting user into connecting to a malicious IMAP server, an attacker could exploit this flaw to potentially cause information disclosure or crash the application.(CVE-2017-1000257)

A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.(CVE-2018-16840)

Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.(CVE-2018-16839)

set_file_metadata in xattr.c in GNU Wget stores a file's origin URL in the user.xdg.origin.url metadata attribute of the extended attributes of the downloaded file, which allows local users to obtain sensitive information (e.g., credentials contained in the URL) by reading this attribute, as demonstrated by getfattr. This also applies to Referer information in the user.xdg.referrer.url metadata attribute. According to 2016-07-22 in the Wget ChangeLog, user.xdg.origin.url was partially based on the behavior of fwrite_xattr in tool_xattr.c in curl.(CVE-2018-20483)

A heap-based buffer overflow has been found in the Curl_smtp_escape_eob() function of curl. An attacker could exploit this by convincing a user to use curl to upload data over SMTP with a reduced buffer to cause a crash or corrupt memory.(CVE-2018-0500)

- xattr: strip credentials from any URL that is stored     (CVE-2018-20483)

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.

This update for wget fixes the following issues :

Security issue fixed :

  - CVE-2018-20483: Fixed an information disclosure through     file metadata (bsc#1120382)

This update was imported from the SUSE:SLE-15:Update update project.

This update for wget fixes the following issues :

Security issue fixed :

CVE-2018-20483: Fixed an information disclosure through file metadata (bsc#1120382)

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.

Update to upstream release 1.20.1 to fix CVE-2018-20483.

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	Name	Product	Family	Severity
239198	TencentOS Server 3: wget (TSSA-2023:0139)	Nessus	Tencent Local Security Checks	high
221984	Linux Distros Unpatched Vulnerability : CVE-2018-20483	Nessus	Misc.	high
202892	Photon OS 2.0: Wget PHSA-2019-2.0-0161	Nessus	PhotonOS Local Security Checks	critical
202778	Photon OS 3.0: Wget PHSA-2019-3.0-0016	Nessus	PhotonOS Local Security Checks	critical
180742	Oracle Linux 8 : curl (ELSA-2019-3701)	Nessus	Oracle Linux Local Security Checks	critical
145603	CentOS 8 : curl (CESA-2019:3701)	Nessus	CentOS Local Security Checks	critical
130568	RHEL 8 : curl (RHSA-2019:3701)	Nessus	Red Hat Local Security Checks	critical
126290	EulerOS 2.0 SP8 : wget (EulerOS-SA-2019-1663)	Nessus	Huawei Local Security Checks	high
126204	Photon OS 1.0: Wget PHSA-2019-1.0-0237	Nessus	PhotonOS Local Security Checks	critical
124047	FreeBSD : wget -- security flaw in caching credentials passed as a part of the URL (a737eb11-5cfc-11e9-ab87-8cec4bf8fcfb)	Nessus	FreeBSD Local Security Checks	high
123973	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Wget vulnerabilities (USN-3943-1)	Nessus	Ubuntu Local Security Checks	critical
122736	GLSA-201903-08 : GNU Wget: Password and metadata leak	Nessus	Gentoo Local Security Checks	high
122260	Amazon Linux 2 : curl (ALAS-2019-1162)	Nessus	Amazon Linux Local Security Checks	critical
122035	Amazon Linux AMI : curl (ALAS-2019-1151)	Nessus	Amazon Linux Local Security Checks	critical
121333	Fedora 29 : curl (2019-427a0ba9e3)	Nessus	Fedora Local Security Checks	high
121284	openSUSE Security Update : wget (openSUSE-2019-57)	Nessus	SuSE Local Security Checks	high
121207	SUSE SLED15 / SLES15 Security Update : wget (SUSE-SU-2019:0093-1)	Nessus	SuSE Local Security Checks	high
121086	Fedora 28 : wget (2019-d1b5cf0055)	Nessus	Fedora Local Security Checks	high
120965	Fedora 29 : wget (2019-088875c43a)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2018-20483

high

Tenable Plugins

high

high

critical

critical

critical

critical

critical

high

critical

high

critical

high

critical

critical

high

high

high

high

high