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

Severity

 Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
1.08% (85th percentile)

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  • Snyk IDSNYK-CENTOS6-NSSSYSINIT-2144100
  • published26 Jul 2021
  • disclosed28 Sept 2017
Report a new vulnerability Found a mistake?

Introduced: 28 Sep 2017

CVE-2017-7805  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Centos:6 nss-sysinit 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-sysinit package and not the nss-sysinit 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.