A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-6831
• https://bugzilla.mozilla.org/show_bug.cgi?id=1632241
• https://security.gentoo.org/glsa/202005-03
• https://security.gentoo.org/glsa/202005-04
• https://usn.ubuntu.com/4373-1/
• https://www.debian.org/security/2020/dsa-4714
• https://www.mozilla.org/security/advisories/mfsa2020-16/
• https://www.mozilla.org/security/advisories/mfsa2020-17/
• https://www.mozilla.org/security/advisories/mfsa2020-18/
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html
• http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html