CVE-2017-18594: Double Free
First published: Wed Aug 28 2019(Updated: )
nse_libssh2.cc in Nmap 7.70 is subject to a denial of service condition due to a double free when an SSH connection fails, as demonstrated by a leading \n character to ssh-brute.nse or ssh-auth-methods.nse.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| libpcap | =7.70 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00073.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00075.html
- https://github.com/AMatchandaHaystack/Research/blob/master/Nmap%26libsshDF
- https://github.com/nmap/nmap/commit/350bbe0597d37ad67abe5fef8fba984707b4e9ad
- https://github.com/nmap/nmap/issues/1077
- https://github.com/nmap/nmap/issues/1227
- https://seclists.org/nmap-announce/2019/0
- https://seclists.org/nmap-dev/2018/q2/45
Frequently Asked Questions
What is the severity of CVE-2017-18594?
CVE-2017-18594 is classified as a denial of service vulnerability.
How do I fix CVE-2017-18594?
To fix CVE-2017-18594, you should upgrade to a version of Nmap later than 7.70.
What software is affected by CVE-2017-18594?
CVE-2017-18594 affects Nmap version 7.70.
What causes the denial of service in CVE-2017-18594?
The denial of service in CVE-2017-18594 is caused by a double free error when an SSH connection fails.
What is the impact of exploiting CVE-2017-18594?
Exploiting CVE-2017-18594 can lead to crashes in the Nmap application.
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- agent/softwarecombine
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- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/nmap
- canonical/libpcap
- version/libpcap/7.70