[ASA-201803-17] libcurl-compat: multiple issues

[Levente Polyak]

Arch Linux Security Advisory ASA-201803-17
==========================================

Severity: Medium
Date    : 2018-03-19
CVE-ID  : CVE-2018-1000120 CVE-2018-1000121 CVE-2018-1000122
Package : libcurl-compat
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-655

Summary
=======

The package libcurl-compat before version 7.59.0-1 is vulnerable to
multiple issues including denial of service and information disclosure.

Resolution
==========

Upgrade to 7.59.0-1.

# pacman -Syu "libcurl-compat>=7.59.0-1"

The problems have been fixed upstream in version 7.59.0.

Workaround
==========

None.

Description
===========

- CVE-2018-1000120 (denial of service)

It was found that libcurl did not safely parse FTP URLs when using the
CURLOPT_FTP_FILEMETHOD method. An attacker, able to provide a specially
crafted FTP URL to an application using libcurl, could write a NULL
byte at an arbitrary location, resulting in a crash, or an unspecified
behavior.

- CVE-2018-1000121 (denial of service)

A NULL pointer dereference exists in the LDAP code of curl >= 7.21.0
and < curl 7.59.0, allowing an attacker to cause a denial of service.
libcurl-using applications that allow LDAP URLs, or that allow
redirects to LDAP URLs could be made to crash by a malicious server.

- CVE-2018-1000122 (information disclosure)

A buffer over-read exists in curl >= 7.20.0 and < 7.59.0 in the
RTSP+RTP handling code that allows an attacker to cause a denial of
service or information leakage. When asked to transfer an RTSP URL,
curl could calculate a wrong data length to copy from the read buffer.
The memcpy call would copy data from the heap following the buffer to a
storage area that would subsequently be delivered to the application
(if it didn't cause a crash). This could lead to information leakage or
a denial of service for the application if the server offering the RTSP
data can trigger this.

Impact
======

A remote attacker is able to crash the application or disclose
sensitive information on the affected host.

References
==========

https://curl.haxx.se/docs/adv_2018-9cd6.html
https://curl.haxx.se/CVE-2018-1000120.patch
https://github.com/curl/curl/commit/535432c0adb62fe167ec09621500470b6fa4eb0f
https://curl.haxx.se/docs/adv_2018-97a2.html
https://curl.haxx.se/CVE-2018-1000121.patch
https://github.com/curl/curl/commit/9889db043393092e9d4b5a42720bba0b3d58deba
https://curl.haxx.se/docs/adv_2018-b047.html
https://curl.haxx.se/CVE-2018-1000122.patch
https://github.com/curl/curl/commit/d52dc4760f6d9ca1937eefa2093058a952465128
https://security.archlinux.org/CVE-2018-1000120
https://security.archlinux.org/CVE-2018-1000121
https://security.archlinux.org/CVE-2018-1000122

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