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CVE-2017-1000257

9.1 · CRITICAL

An IMAP FETCH response line indicates the size of the returned data, in number of bytes.

Published Oct 31, 2017CWE-119EPSS 6.22%

Overview

CVE-2017-1000257 is a critical-severity vulnerability. It was published on October 31, 2017 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer and the size (zero) to the deliver-data function. libcurl's deliver-data function treats zero as a magic number and invokes strlen() on the data to figure out the length. The strlen() is called on a heap based buffer that might not be zero terminated so libcurl might read beyond the end of it into whatever memory lies after (or just crash) and then deliver that to the application as if it was actually downloaded.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.debian.org/security/2017/dsa-4007Refwww.securityfocus.com/bid/101519Refwww.securitytracker.com/id/1039644Refaccess.redhat.com/errata/RHSA-2017:3263Refaccess.redhat.com/errata/RHSA-2018:2486Refaccess.redhat.com/errata/RHSA-2018:3558Refcurl.haxx.se/docs/adv_20171023.htmlRefsecurity.gentoo.org/glsa/201712-04Refwww.debian.org/security/2017/dsa-4007Refwww.securityfocus.com/bid/101519

How CyberStrike helps

Frequently asked questions

What is CVE-2017-1000257?

CVE-2017-1000257 is a critical-severity vulnerability. It was published on October 31, 2017 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2017-1000257?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-1000257?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-1000257?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-1000257 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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