Use After Free Affecting firefox package, versions <56.0+build6-0ubuntu0.16.04.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-FIREFOX-424039
- published11 Jun 2018
- disclosed11 Jun 2018
Introduced: 11 Jun 2018
CVE-2017-7805 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 firefox to version 56.0+build6-0ubuntu0.16.04.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-7805
- https://www.debian.org/security/2017/dsa-3987
- https://www.debian.org/security/2017/dsa-3998
- https://www.debian.org/security/2017/dsa-4014
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
- https://security-tracker.debian.org/tracker/CVE-2017-7805
- https://security.gentoo.org/glsa/201803-14
- https://www.mozilla.org/security/advisories/mfsa2017-21/
- https://www.mozilla.org/security/advisories/mfsa2017-22/
- https://www.mozilla.org/security/advisories/mfsa2017-23/
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618
- https://access.redhat.com/errata/RHSA-2017:2832
- http://www.securityfocus.com/bid/101059
- http://www.securitytracker.com/id/1039465