CVE-2017-7805: Use After Free
First published: Fri Jul 14 2017(Updated: )
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.
Credit: security@mozilla.org security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <52.4 | 52.4 |
| Mozilla Thunderbird | <52.4 | 52.4 |
| Mozilla Firefox | <56 | 56 |
| Mozilla Firefox | =56.0 | |
| Mozilla Firefox ESR | =52.4.0 | |
| Mozilla Thunderbird | =52.4.0 | |
| Debian Debian Linux | =7.0 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| debian/firefox | 131.0.2-2 | |
| debian/firefox-esr | 115.14.0esr-1~deb11u1 128.3.1esr-1~deb11u1 115.14.0esr-1~deb12u1 128.3.1esr-1~deb12u1 128.3.0esr-2 128.3.1esr-2 | |
| debian/nss | 2:3.61-1+deb11u3 2:3.87.1-1 2:3.105-2 | |
| debian/thunderbird | 1:115.12.0-1~deb11u1 1:115.16.0esr-1~deb11u1 1:115.12.0-1~deb12u1 1:115.16.0esr-1~deb12u1 1:128.2.0esr-1 1:128.3.0esr-1 | |
| Mozilla Firefox | =52.4.0 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-22/
- https://www.mozilla.org/security/advisories/mfsa2017-21/
- https://www.mozilla.org/security/advisories/mfsa2017-22/
- https://www.mozilla.org/security/advisories/mfsa2017-23/
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
- 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://access.redhat.com/errata/RHSA-2017:2832
- http://www.securityfocus.com/bid/101059
- http://www.securitytracker.com/id/1039465
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://launchpad.net/bugs/cve/CVE-2017-7805
- https://hg.mozilla.org/projects/nss/rev/839200ce0943166a079284bdf45dcc37bb672925
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-21/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1496926
- https://bugzilla.redhat.com/show_bug.cgi?id=1471171
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-22/#CVE-2017-7805
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-23/
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-21/#CVE-2017-7822
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-21/#CVE-2017-7805
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-23/#CVE-2017-7805
- https://security-tracker.debian.org/tracker/CVE-2017-7805
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7805
- https://nvd.nist.gov/vuln/detail/CVE-2017-7805
- https://ubuntu.com/security/CVE-2017-7805
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2017-7805?
CVE-2017-7805 is a vulnerability in Mozilla Firefox and Thunderbird that allows an attacker to cause a denial of service or execute arbitrary code.
What is the severity of CVE-2017-7805?
CVE-2017-7805 has a severity rating of high.
How does CVE-2017-7805 affect Mozilla Firefox and Thunderbird?
CVE-2017-7805 affects Mozilla Firefox versions up to and including 56.0 and Thunderbird versions up to and including 52.4.0.
How can I fix CVE-2017-7805?
To fix CVE-2017-7805, update Mozilla Firefox to version 56.0+ and Thunderbird to version 52.4.0+.
Where can I find more information about CVE-2017-7805?
You can find more information about CVE-2017-7805 in the Mozilla Bugzilla, Mozilla Security Advisories, and Oracle Security Advisory.
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