Mozilla Foundation Security Advisory 2025-02

Security Vulnerabilities fixed in Firefox ESR 128.6

Announced
January 7, 2025
Impact
moderate
Products
Firefox ESR
Fixed in
  • Firefox ESR 128.6

#CVE-2025-0237: WebChannel APIs susceptible to confused deputy attack

Reporter
Andrew McCreight
Impact
moderate
Description

The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent. This could have led to privilege escalation attacks.

References

#CVE-2025-0238: Use-after-free when breaking lines in text

Reporter
Irvan Kurniawan
Impact
moderate
Description

Assuming a controlled failed memory allocation, an attacker could have caused a use-after-free, leading to a potentially exploitable crash.

References

#CVE-2025-0239: Alt-Svc ALPN validation failure when redirected

Reporter
Paul Gerste
Impact
moderate
Description

When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site.

References

#CVE-2025-0240: Compartment mismatch when parsing JavaScript JSON module

Reporter
Nils Bars
Impact
moderate
Description

Parsing a JavaScript module as JSON could under some circumstances cause cross-compartment access, which may result in a use-after-free.

References

#CVE-2025-0241: Memory corruption when using JavaScript Text Segmentation

Reporter
Nils Bars
Impact
moderate
Description

When segmenting specially crafted text, segmentation would corrupt memory leading to a potentially exploitable crash.

References

#CVE-2025-0242: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6

Reporter
Andrew McCreight, Tooru Fujisawa, and the Mozilla Fuzzing Team
Impact
high
Description

Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5. 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

#CVE-2025-0243: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6

Reporter
Andrew Osmond and the Mozilla Fuzzing Team
Impact
moderate
Description

Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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