CVE-2017-7805 Use after free in Firefox
A use-after-free flaw in Firefox TLS handshake processing allows attackers to cause a crash or potentially execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-7805?
CVE-2017-7805 is a high-severity use after free vulnerability in Debian Debian Linux, published on 11 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-416
Which versions are affected by CVE-2017-7805?
It affects 3 products.
Linux distribution packages (40)
nss Red Hat:enterprise_linux:6::client | All versions | 0:3.28.4-4.el6_9 |
nss-debuginfo Red Hat:enterprise_linux:6::client | All versions | 0:3.28.4-4.el6_9 |
nss-devel Red Hat:enterprise_linux:6::client | All versions | 0:3.28.4-4.el6_9 |
nss-pkcs11-devel Red Hat:enterprise_linux:6::client | All versions | 0:3.28.4-4.el6_9 |
nss-sysinit Red Hat:enterprise_linux:6::client | All versions | 0:3.28.4-4.el6_9 |
nss-tools Red Hat:enterprise_linux:6::client | All versions | 0:3.28.4-4.el6_9 |
nss Red Hat:enterprise_linux:6::computenode | All versions | 0:3.28.4-4.el6_9 |
nss-debuginfo Red Hat:enterprise_linux:6::computenode | All versions | 0:3.28.4-4.el6_9 |
nss-devel Red Hat:enterprise_linux:6::computenode | All versions | 0:3.28.4-4.el6_9 |
nss-pkcs11-devel Red Hat:enterprise_linux:6::computenode | All versions | 0:3.28.4-4.el6_9 |
nss-sysinit Red Hat:enterprise_linux:6::computenode | All versions | 0:3.28.4-4.el6_9 |
nss-tools Red Hat:enterprise_linux:6::computenode | All versions | 0:3.28.4-4.el6_9 |
nss Red Hat:enterprise_linux:6::server | All versions | 0:3.28.4-4.el6_9 |
nss-debuginfo Red Hat:enterprise_linux:6::server | All versions | 0:3.28.4-4.el6_9 |
nss-devel Red Hat:enterprise_linux:6::server | All versions | 0:3.28.4-4.el6_9 |
nss-pkcs11-devel Red Hat:enterprise_linux:6::server | All versions | 0:3.28.4-4.el6_9 |
nss-sysinit Red Hat:enterprise_linux:6::server | All versions | 0:3.28.4-4.el6_9 |
nss-tools Red Hat:enterprise_linux:6::server | All versions | 0:3.28.4-4.el6_9 |
nss Red Hat:enterprise_linux:6::workstation | All versions | 0:3.28.4-4.el6_9 |
nss-debuginfo Red Hat:enterprise_linux:6::workstation | All versions | 0:3.28.4-4.el6_9 |
nss-devel Red Hat:enterprise_linux:6::workstation | All versions | 0:3.28.4-4.el6_9 |
nss-pkcs11-devel Red Hat:enterprise_linux:6::workstation | All versions | 0:3.28.4-4.el6_9 |
nss-sysinit Red Hat:enterprise_linux:6::workstation | All versions | 0:3.28.4-4.el6_9 |
nss-tools Red Hat:enterprise_linux:6::workstation | All versions | 0:3.28.4-4.el6_9 |
nss Red Hat:enterprise_linux:7::client | All versions | 0:3.28.4-12.el7_4 |
nss-debuginfo Red Hat:enterprise_linux:7::client | All versions | 0:3.28.4-12.el7_4 |
nss-devel Red Hat:enterprise_linux:7::client | All versions | 0:3.28.4-12.el7_4 |
nss-pkcs11-devel Red Hat:enterprise_linux:7::client | All versions | 0:3.28.4-12.el7_4 |
nss-sysinit Red Hat:enterprise_linux:7::client | All versions | 0:3.28.4-12.el7_4 |
nss-tools Red Hat:enterprise_linux:7::client | All versions | 0:3.28.4-12.el7_4 |
nss Red Hat:enterprise_linux:7::computenode | All versions | 0:3.28.4-12.el7_4 |
nss-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 0:3.28.4-12.el7_4 |
nss-devel Red Hat:enterprise_linux:7::computenode | All versions | 0:3.28.4-12.el7_4 |
nss-pkcs11-devel Red Hat:enterprise_linux:7::computenode | All versions | 0:3.28.4-12.el7_4 |
nss-sysinit Red Hat:enterprise_linux:7::computenode | All versions | 0:3.28.4-12.el7_4 |
nss-tools Red Hat:enterprise_linux:7::computenode | All versions | 0:3.28.4-12.el7_4 |
nss Red Hat:enterprise_linux:7::server | All versions | 0:3.28.4-12.el7_4 |
nss-debuginfo Red Hat:enterprise_linux:7::server | All versions | 0:3.28.4-12.el7_4 |
nss-devel Red Hat:enterprise_linux:7::server | All versions | 0:3.28.4-12.el7_4 |
nss-pkcs11-devel Red Hat:enterprise_linux:7::server | All versions | 0:3.28.4-12.el7_4 |
Products include Debian Debian Linux, Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2017-7805?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2017-7805 being exploited?
There is no known exploitation of CVE-2017-7805 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2017-7805, DLA-1138-1, DSA-3998-1, GHSA-595h-pjc7-9xf6, RHSA-2017:2832, UBUNTU-CVE-2017-7805 and 1 more.