UBUNTU-CVE-2018-1000005

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.

References

Affected packages

Ubuntu:16.04:LTS / curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl@7.47.0-1ubuntu2.6?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

7.47.0-1ubuntu2.6

Affected versions

7.*

7.43.0-1ubuntu2

7.45.0-1ubuntu1

7.46.0-1ubuntu1

7.47.0-1ubuntu1

7.47.0-1ubuntu2

7.47.0-1ubuntu2.1

7.47.0-1ubuntu2.2

7.47.0-1ubuntu2.3

7.47.0-1ubuntu2.4

7.47.0-1ubuntu2.5

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.47.0-1ubuntu2.6"
        },
        {
            "binary_name": "libcurl3",
            "binary_version": "7.47.0-1ubuntu2.6"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.47.0-1ubuntu2.6"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.47.0-1ubuntu2.6"
        },
        {
            "binary_name": "libcurl4-gnutls-dev",
            "binary_version": "7.47.0-1ubuntu2.6"
        },
        {
            "binary_name": "libcurl4-nss-dev",
            "binary_version": "7.47.0-1ubuntu2.6"
        },
        {
            "binary_name": "libcurl4-openssl-dev",
            "binary_version": "7.47.0-1ubuntu2.6"
        }
    ]
}