CVE-2017-7756: Use After Free

Reference Links

• https://bugzilla.mozilla.org/show_bug.cgi?id=1366595
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-17/
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-15/
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-16/
• http://www.securityfocus.com/bid/99057
• http://www.securitytracker.com/id/1038689
• https://access.redhat.com/errata/RHSA-2017:1440
• https://access.redhat.com/errata/RHSA-2017:1561
• https://www.debian.org/security/2017/dsa-3881
• https://www.debian.org/security/2017/dsa-3918
• https://www.mozilla.org/security/advisories/mfsa2017-15/
• https://www.mozilla.org/security/advisories/mfsa2017-16/
• https://www.mozilla.org/security/advisories/mfsa2017-17/
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-16/#CVE-2017-7756
• https://bugzilla.redhat.com/show_bug.cgi?id=1461258
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-15/#CVE-2017-7756
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-17/#CVE-2017-7756
• https://security-tracker.debian.org/tracker/CVE-2017-7756

Parent vulnerabilities

(Appears in the following advisories)

• MFSA2017-17
• MFSA2017-15
• MFSA2017-16

Peer vulnerabilities

(Found alongside the following vulnerabilities)

• CVE-2017-5472
• CVE-2017-7749
• CVE-2017-7750
• CVE-2017-7751
• CVE-2017-7755
• CVE-2017-7752
• CVE-2017-7754
• CVE-2017-7756
• CVE-2017-7757
• CVE-2017-7778
• CVE-2017-7758
• CVE-2017-7763
• CVE-2017-7764
• CVE-2017-7765
• CVE-2017-5470
• CVE-2017-7759
• CVE-2017-7760
• CVE-2017-7761
• CVE-2017-7762
• CVE-2017-7766
• CVE-2017-7767
• CVE-2017-7768
• CVE-2017-7770
• CVE-2017-5471

Frequently Asked Questions

• What is the severity of CVE-2017-7756?

  CVE-2017-7756 has a moderate severity level due to its potential to cause crashes in affected applications.

• How do I fix CVE-2017-7756?

  To fix CVE-2017-7756, update your Mozilla Firefox or Thunderbird to versions above 54.0 or 52.2 respectively.

• Which products are affected by CVE-2017-7756?

  CVE-2017-7756 affects Mozilla Firefox versions 54 and below, Mozilla Firefox ESR up to version 52.2, and Mozilla Thunderbird up to version 52.2.

• What is a use-after-free vulnerability as seen in CVE-2017-7756?

  A use-after-free vulnerability, like CVE-2017-7756, occurs when a program attempts to access memory after it has already been freed, which can lead to application crashes or exploitation.

• Is there a workaround for CVE-2017-7756?

  There are no known workarounds for CVE-2017-7756 other than upgrading to the latest versions of the affected software.