The _asn1_check_identifier function in GNU Libtasn1 through 4.12 causes a NULL pointer dereference and crash when reading crafted input that triggers assignment of a NULL value within an asn1_node structure. It may lead to a remote denial of service attack.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libtasn1 | Gnu | * | 4.12 (including) |
| Libtasn1-3 | Ubuntu | precise/esm | * |
| Libtasn1-6 | Ubuntu | esm-infra-legacy/trusty | * |
| Libtasn1-6 | Ubuntu | esm-infra/xenial | * |
| Libtasn1-6 | Ubuntu | trusty | * |
| Libtasn1-6 | Ubuntu | trusty/esm | * |
| Libtasn1-6 | Ubuntu | vivid/ubuntu-core | * |
| Libtasn1-6 | Ubuntu | xenial | * |
| Libtasn1-6 | Ubuntu | yakkety | * |
| Libtasn1-6 | Ubuntu | zesty | * |
Potential Mitigations
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1464141
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/06/msg00026.html
- https://security.gentoo.org/glsa/201710-11
- https://usn.ubuntu.com/3547-1/
- https://www.debian.org/security/2018/dsa-4106
- https://bugzilla.redhat.com/show_bug.cgi?id=1464141
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/06/msg00026.html
- https://security.gentoo.org/glsa/201710-11
- https://usn.ubuntu.com/3547-1/
- https://www.debian.org/security/2018/dsa-4106