An issue was discovered in GNU gettext 0.19.8. There is a double free in default_add_message in read-catalog.c, related to an invalid free in po_gram_parse in po-gram-gen.y, as demonstrated by lt-msgfmt.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Gettext | Gnu | 0.19.8 (including) | 0.19.8 (including) |
| Red Hat Enterprise Linux 7 | RedHat | gettext-0:0.19.8.1-3.el7 | * |
| Red Hat Enterprise Linux 7.6 Extended Update Support | RedHat | gettext-0:0.19.8.1-3.el7_6 | * |
| Red Hat Enterprise Linux 7.7 Extended Update Support | RedHat | gettext-0:0.19.8.1-3.el7_7 | * |
| Red Hat Enterprise Linux 8 | RedHat | gettext-0:0.19.8.1-17.el8 | * |
| Gettext | Ubuntu | bionic | * |
| Gettext | Ubuntu | cosmic | * |
| Gettext | Ubuntu | devel | * |
| Gettext | Ubuntu | esm-infra-legacy/trusty | * |
| Gettext | Ubuntu | esm-infra/bionic | * |
| Gettext | Ubuntu | esm-infra/xenial | * |
| Gettext | Ubuntu | trusty | * |
| Gettext | Ubuntu | trusty/esm | * |
| Gettext | Ubuntu | xenial | * |
Potential Mitigations
References
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00061.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00065.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00025.html
- https://access.redhat.com/errata/RHSA-2019:3643
- https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree
- https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption
- https://usn.ubuntu.com/3815-1/
- https://usn.ubuntu.com/3815-2/
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00061.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00065.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00025.html
- https://access.redhat.com/errata/RHSA-2019:3643
- https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/doublefree
- https://github.com/CCCCCrash/POCs/tree/master/Bin/Tools-gettext-0.19.8.1/heapcorruption
- https://usn.ubuntu.com/3815-1/
- https://usn.ubuntu.com/3815-2/