CVE-2018-1000005

Public on 2018-02-07
Modified on 2018-04-05
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.
Severity
Low
CVSS v3 Base Score
4.8
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 curl 2018-02-07 18:08 ALAS2-2018-951
Amazon Linux 1 curl 2018-02-20 20:57 ALAS-2018-951

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.8 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
NVD CVSSv2 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P
NVD CVSSv3 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H