Use After Free Affecting nss-devel package, versions <0:3.28.4-12.el7_4
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-RHEL7-NSSDEVEL-4730165
- published26 Jul 2021
- disclosed28 Sept 2017
Introduced: 28 Sep 2017
CVE-2017-7805 (opens in a new tab)How to fix?
Upgrade RHEL:7 nss-devel to version 0:3.28.4-12.el7_4 or higher.
This issue was patched in RHSA-2017:2832.
NVD Description
Note: Versions mentioned in the description apply only to the upstream nss-devel package and not the nss-devel package as distributed by RHEL.
See How to fix? for RHEL:7 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://www.securityfocus.com/bid/101059
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618
- 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://access.redhat.com/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://security.gentoo.org/glsa/201803-14
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
- https://access.redhat.com/errata/RHSA-2017:2832
- http://www.securitytracker.com/id/1039465