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Mozilla Foundation Security Advisory 2020-21

Security Vulnerabilities fixed in Firefox ESR 68.9

Announced
June 2, 2020
Impact
high
Products
Firefox ESR
Fixed in
  • Firefox ESR 68.9

#CVE-2020-12399: Timing attack on DSA signatures in NSS library

Reporter
Cesar Pereida Garcia and the Network and Information Security Group (NISEC) at Tampere University
Impact
high
Description

NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys.

References

#CVE-2020-12405: Use-after-free in SharedWorkerService

Reporter
Marcin 'Icewall' Noga of Cisco Talos
Impact
high
Description

When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash.

References

#CVE-2020-12406: JavaScript Type confusion with NativeTypes

Reporter
Iain Ireland
Impact
high
Description

Mozilla developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code.

References

#CVE-2020-12410: Memory safety bugs fixed in Firefox 77 and Firefox ESR 68.9

Reporter
Mozilla developers
Impact
high
Description

Mozilla developers Tom Tung and Karl Tomlinson reported memory safety bugs present in Firefox 76 and Firefox ESR 68.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

References