CVE-2018-1000005

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    CVE-2018-1000005

    Published: 24 Jan 2018Last Modified: 8 Jul 2026

    Summary:

    Details: 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: http://www.securitytracker.com/id/1040273, https://access.redhat.com/errata/RHSA-2019:1543, https://usn.ubuntu.com/3554-1/, https://www.debian.org/security/2018/dsa-4098, https://curl.haxx.se/docs/adv_2018-824a.html, https://github.com/curl/curl/pull/2231

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 67fe54d918a3b42a24cb7f5db81514c10e239735
    Fixed -None

    Affected versions

    curl-7_57_0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High