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Out-of-bounds Read Affecting curl package, versions <7.58.0-1

0.0
critical

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Availability High

    Threat Intelligence

    EPSS 0.65% (80th percentile)
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NVD
9.1 critical
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Red Hat
4.8 medium

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  • Snyk ID SNYK-DEBIAN11-CURL-522884
  • published 24 Jan 2018
  • disclosed 24 Jan 2018
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Introduced: 24 Jan 2018

CVE-2018-1000005 Open this link in a new tab
CWE-125 Open this link in a new tab

How to fix?

Upgrade Debian:11 curl to version 7.58.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like : to the target buffer, while this was recently changed to : (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.