1042013

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16840

https://curl.haxx.se/docs/CVE-2018-16840.html

https://github.com/curl/curl/commit/81d135d67155c5295b1033679c606165d4e28f3f

GLSA-201903-03

USN-3805-1

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

  - 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 before 7.68.0 lacks proper input validation, which     allows users to create a `FILE:` URL that can make the     client access a remote file using SMB (Windows-only     issue).(CVE-2019-15601)

  - cURL and libcurl 7.18.0 through 7.32.0, when built with     OpenSSL, disables the certificate CN and SAN name field     verification (CURLOPT_SSL_VERIFYHOST) when the digital     signature verification (CURLOPT_SSL_VERIFYPEER) is     disabled, which allows man-in-the-middle attackers to     spoof SSL servers via an arbitrary valid     certificate.(CVE-2013-4545)

  - The GnuTLS backend in libcurl 7.21.4 through 7.33.0,     when disabling digital signature verification     (CURLOPT_SSL_VERIFYPEER), also disables the     CURLOPT_SSL_VERIFYHOST check for CN or SAN host name     fields, which makes it easier for remote attackers to     spoof servers and conduct man-in-the-middle (MITM)     attacks.(CVE-2013-6422)

  - cURL and libcurl 7.1 before 7.36.0, when using the     OpenSSL, axtls, qsossl or gskit libraries for TLS,     recognize a wildcard IP address in the subject's Common     Name (CN) field of an X.509 certificate, which might     allow man-in-the-middle attackers to spoof arbitrary     SSL servers via a crafted certificate issued by a     legitimate Certification Authority.(CVE-2014-0139)

  - The (1) mbed_connect_step1 function in     lib/vtls/mbedtls.c and (2) polarssl_connect_step1     function in lib/vtls/polarssl.c in cURL and libcurl     before 7.49.0, when using SSLv3 or making a TLS     connection to a URL that uses a numerical IP address,     allow remote attackers to spoof servers via an     arbitrary valid certificate.(CVE-2016-3739)

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.

This update for curl fixes the following issues :

  - CVE-2018-16839: A SASL password overflow via integer     overflow was fixed which could lead to crashes     (bsc#1112758)

  - CVE-2018-16840: A use-after-free in SASL handle close     was fixed which could lead to crashes (bsc#1112758)

  - CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was     fixed which could lead to crashes (bsc#1113660)

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

The remote host is affected by the vulnerability described in GLSA-201903-03 (cURL: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in cURL. Please review the       CVE identifiers referenced below for details.
  Impact :

    Remote attackers could cause a Denial of Service condition.
  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)

This update for curl fixes the following issues :

Security issues fixed :

CVE-2019-3822: Fixed a NTLMv2 type-3 header stack-based buffer overflow (bsc#1123377).

CVE-2019-3823: Fixed an out-of-bounds read in the SMTP end-of-response (bsc#1123378).

CVE-2018-16890: Fixed an out-of-bounds buffer read in NTLM type2 (bsc#1123371).

CVE-2018-16842: Fixed an out-of-bounds read in tool_msgs.c (bsc#1113660).

CVE-2018-16840: Fixed a use-after-free in handle close (bsc#1113029).

CVE-2018-16839: Fixed an SASL password overflow caused by an integer overflow (bsc#1112758).

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.

An update of the curl package has been released.

A heap use-after-free flaw was found in curl 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 is vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service. (CVE-2018-16839)

Curl is 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)

- SASL password overflow via integer overflow     (CVE-2018-16839)

  - fix use-after-free in handle close (CVE-2018-16840)

  - fix bad arethmetic when outputting warnings to stderr     (CVE-2018-16842)

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 curl fixes the following issues :

CVE-2018-16839: A SASL password overflow via integer overflow was fixed which could lead to crashes (bsc#1112758)

CVE-2018-16840: A use-after-free in SASL handle close was fixed which could lead to crashes (bsc#1112758)

CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

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.

This update for curl fixes the following issues :

  - CVE-2018-16840: A use after free in closing SASL handles     was fixed (bsc#1112758)

  - CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was     fixed which could lead to crashes (bsc#1113660)

This update was imported from the SUSE:SLE-12:Update update project.

This update for curl fixes the following issues :

CVE-2018-16840: A use-after-free in SASL handle close was fixed (bsc#1112758)

CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

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.

This update for curl fixes the following issues :

CVE-2018-16840: A use after free in closing SASL handles was fixed (bsc#1112758)

CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)

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.

curl security problems :

CVE-2018-16839: SASL password overflow via integer overflow

libcurl contains a buffer overrun in the SASL authentication code.

The internal function Curl_auth_create_plain_message fails to correctly verify that the passed in lengths for name and password aren't too long, then calculates a buffer size to allocate.

On systems with a 32 bit size_t, the math to calculate the buffer size triggers an integer overflow when the user name length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow.

This bug is very similar to CVE-2017-14618.

It affects curl 7.33.0 to 7.61.1.

CVE-2018-16840: use-after-free in handle close

libcurl contains a heap use-after-free flaw in 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.

It affects curl 7.59.0 to 7.61.1.

CVE-2018-16842: warning message out-of-buffer read

curl contains a heap out of buffer read vulnerability.

The command line tool has a generic function for displaying warning and informational messages to stderr for various situations. For example if an unknown command line argument is used, or passed to it in a 'config' file.

This display function formats the output to wrap at 80 columns. The wrap logic is however flawed, so if a single word in the message is itself longer than 80 bytes the buffer arithmetic calculates the remainder wrong and will end up reading behind the end of the buffer.
This could lead to information disclosure or crash.

This vulnerability could lead to a security issue if used in this or similar situations :

1. a server somewhere uses the curl command line to run something

2. if it fails, it shows stderr to the user

3. the server takes user input for parts of its command line input

4. user provides something overly long that triggers this crash

5. the stderr output may now contain user memory contents that wasn't meant to be available

It affects curl 7.14.1 to 7.61.1.

Harry Sintonen discovered that curl incorrectly handled SASL authentication. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-16839)

Brian Carpenter discovered that curl incorrectly handled memory when closing certain handles. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-16840)

Brian Carpenter discovered that the curl command-line tool incorrectly handled error messages. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2018-16842).

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

New curl packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix security issues.

ID	Name	Product	Family	Severity
137468	EulerOS 2.0 SP2 : curl (EulerOS-SA-2020-1626)	Nessus	Huawei Local Security Checks	high
123369	openSUSE Security Update : curl (openSUSE-2019-903)	Nessus	SuSE Local Security Checks	high
122731	GLSA-201903-03 : cURL: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
122260	Amazon Linux 2 : curl (ALAS-2019-1162)	Nessus	Amazon Linux Local Security Checks	high
122149	SUSE SLED12 / SLES12 Security Update : curl (SUSE-SU-2019:0339-1)	Nessus	SuSE Local Security Checks	high
122015	Photon OS 1.0: Curl PHSA-2019-1.0-0203	Nessus	PhotonOS Local Security Checks	critical
121369	Amazon Linux AMI : curl (ALAS-2019-1148)	Nessus	Amazon Linux Local Security Checks	high
120934	Fedora 28 : curl (2018-fdc4ca8675)	Nessus	Fedora Local Security Checks	high
120542	Fedora 29 : curl (2018-7785911c9e)	Nessus	Fedora Local Security Checks	high
120154	SUSE SLED15 / SLES15 Security Update : curl (SUSE-SU-2018:3624-1)	Nessus	SuSE Local Security Checks	high
118879	openSUSE Security Update : curl (openSUSE-2018-1383)	Nessus	SuSE Local Security Checks	high
118876	openSUSE Security Update : curl (openSUSE-2018-1379)	Nessus	SuSE Local Security Checks	high
118854	SUSE SLES11 Security Update : curl (SUSE-SU-2018:3681-1)	Nessus	SuSE Local Security Checks	high
118729	SUSE SLED12 / SLES12 Security Update : curl (SUSE-SU-2018:3608-1)	Nessus	SuSE Local Security Checks	high
118707	FreeBSD : curl -- multiple vulnerabilities (e0ab1773-07c1-46c6-9170-4c5e81c00927)	Nessus	FreeBSD Local Security Checks	high
118591	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : curl vulnerabilities (USN-3805-1)	Nessus	Ubuntu Local Security Checks	high
118586	Slackware 14.0 / 14.1 / 14.2 / current : curl (SSA:2018-304-01)	Nessus	Slackware Local Security Checks	high

CVE-2018-16840

Description

References

Details

Risk Information

CVSS v2.0

CVSS v3.0

Vulnerable Software

Configuration 1

Configuration 2

Tenable Plugins