A double-free issue could have occurred in sec_pkcs7_decoder_start_decrypt() when handling an error path. Under specific conditions, the same symmetric key could have been freed twice, potentially leading to memory corruption. This vulnerability affects Firefox < 133, Thunderbird < 133, Firefox ESR < 128.7, and Thunderbird < 128.7.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firefox | Mozilla | * | 128.7.0 (excluding) |
| Firefox | Mozilla | * | 133.0 (excluding) |
| Thunderbird | Mozilla | * | 128.7.0 (excluding) |
| Thunderbird | Mozilla | 129.0 (including) | 133.0 (excluding) |
| Firefox | Ubuntu | focal | * |
| Mozjs102 | Ubuntu | esm-apps/noble | * |
| Mozjs102 | Ubuntu | jammy | * |
| Mozjs102 | Ubuntu | noble | * |
| Mozjs115 | Ubuntu | noble | * |
| Mozjs115 | Ubuntu | oracular | * |
| Mozjs115 | Ubuntu | plucky | * |
| Mozjs52 | Ubuntu | esm-infra/bionic | * |
| Mozjs52 | Ubuntu | focal | * |
| Mozjs68 | Ubuntu | esm-infra/focal | * |
| Mozjs68 | Ubuntu | focal | * |
| Mozjs78 | Ubuntu | jammy | * |
| Mozjs91 | Ubuntu | jammy | * |
Potential Mitigations
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1899402
- https://www.mozilla.org/security/advisories/mfsa2024-63/
- https://www.mozilla.org/security/advisories/mfsa2024-67/
- https://www.mozilla.org/security/advisories/mfsa2025-09/
- https://www.mozilla.org/security/advisories/mfsa2025-10/
- https://lists.debian.org/debian-lts-announce/2025/02/msg00005.html
- https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html