CVE-2018-1000005

Description

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.

How to fix CVE-2018-1000005

To remediate CVE-2018-1000005, upgrade the affected package to a fixed version below.

• —upgrade to 7.58.0-r0 or later
• —upgrade to 7.58.0-1 or later

Is CVE-2018-1000005 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 7.58.0-r0
• from 0, < 7.58.0-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2018-1000005
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2018-1000005