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Security Bulletin: Vulnerabilities in cURL component shipped with IBM Rational ClearCase (CVE-2018-1000005, CVE-2018-1000007)

Security Bulletin


IBM Rational ClearCase is affected by cURL/libcURL vulnerabilities.

Vulnerability Details

CVEID: CVE-2018-1000007
cURL liburl could allow a remote attacker to obtain sensitive information, caused by a flaw when passing on custom Authorization: headers. By sending a specially-crafted HTTP redirects request, a remote attacker could exploit this vulnerability to obtain sensitive information.
CVSS Base Score: 7.5
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID: CVE-2018-1000005
cURL libcurl is vulnerable to a denial of service, caused by an out-of-bounds read flaw in code handling HTTP/2 trailers. By sending specially-crafted HTTP/2 trailer data, a remote attacker could exploit this vulnerability to cause a denial of service or information disclosure condition.
CVSS Base Score: 9.1
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)

Affected Products and Versions

The cURL component is used in the CMI integration, the OSLC-based ClearQuest integration, and in the automatic view client.

ClearCase client version
9.0.1 through
9.0 through
8.0.1 through
8.0 through


The solution is to upgrade to a fix pack of ClearCase that fixes the vulnerabilities in the cURL component.

Affected Versions
Applying the fix
9.0.1 through
9.0 through
Install Rational ClearCase Fix Pack 3 ( for 9.0.1
8.0.1 through
8.0 through
Install Rational ClearCase Fix Pack 17 ( for 8.0.1
For 7.0, 7.1, and earlier releases, IBM recommends upgrading to a fixed, supported version/release/platform of the product.

Workarounds and Mitigations


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Important Note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.



Change History

30 April 2018: Original copy published

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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Document Information

Modified date:
10 July 2018