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Use After Free Affecting nss-tools package, versions <0:3.28.4-4.el6_9

0.0
high

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 1.35% (86th percentile)
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NVD
7.5 high
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Red Hat
7.5 high

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  • Snyk ID SNYK-CENTOS6-NSSTOOLS-2146707
  • published 26 Jul 2021
  • disclosed 28 Sep 2017
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Introduced: 28 Sep 2017

CVE-2017-7805 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade Centos:6 nss-tools to version 0:3.28.4-4.el6_9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nss-tools package and not the nss-tools package as distributed by Centos. See How to fix? for Centos:6 relevant fixed versions and status.

During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.