7.5
CWE
476
Advisory Published
Updated

CVE-2018-0490: Null Pointer Dereference

First published: Mon Mar 05 2018(Updated: )

An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.

Credit: security@debian.org

Affected SoftwareAffected VersionHow to fix
debian/tor
0.3.5.16-1
0.3.5.16-1+deb10u1
0.4.5.16-1
0.4.7.13-1
0.4.8.7-1
Torproject Tor<=0.2.9.14
Torproject Tor>=0.3.1.7<=0.3.1.9
Torproject Tor=0.3.1.1-alpha
Torproject Tor=0.3.1.2-alpha
Torproject Tor=0.3.1.3-alpha
Torproject Tor=0.3.1.4-alpha
Torproject Tor=0.3.1.5-alpha
Torproject Tor=0.3.1.6-rc
Torproject Tor=0.3.2.1-alpha
Torproject Tor=0.3.2.2-alpha
Torproject Tor=0.3.2.3-alpha
Torproject Tor=0.3.2.4-alpha
Torproject Tor=0.3.2.5-alpha
Torproject Tor=0.3.2.6-alpha
Torproject Tor=0.3.2.7-rc
Torproject Tor=0.3.2.8-rc
Torproject Tor=0.3.2.9
Debian Debian Linux=9.0

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Frequently Asked Questions

  • What is CVE-2018-0490?

    CVE-2018-0490 is a vulnerability in Tor that allows remote attackers to cause a denial of service via a misformatted protocol-list subprotocol implementation, resulting in a NULL pointer dereference and directory-authority crash.

  • What is the severity of CVE-2018-0490?

    The severity of CVE-2018-0490 is high, with a CVSS score of 7.5.

  • How does CVE-2018-0490 impact Tor?

    CVE-2018-0490 can cause a denial of service, leading to a crash of the Tor directory authority.

  • How can I fix CVE-2018-0490?

    To fix CVE-2018-0490, it is recommended to update Tor to version 0.3.5.16-1 or later.

  • Where can I find more information about CVE-2018-0490?

    You can find more information about CVE-2018-0490 in the Tor Project's ticket and blog post, as well as the Git commit related to the vulnerability.

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