In LibTomCrypt through 1.18.2, the der_decode_utf8_string function (in der_decode_utf8_string.c) does not properly detect certain invalid UTF-8 sequences. This allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) or read information from other memory locations via carefully crafted DER-encoded data.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-17362
• libtom/libtomcrypt#507
• libtom/libtomcrypt#508
• https://lists.debian.org/debian-lts-announce/2019/10/msg00010.html
• https://vuldb.com/?id.142995
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00020.html
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00041.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/47YP5SXQ4RY6KMTK2HI5ZZR244XKRMCZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YU5OMCY3PX54YVI4FMNDEENHDJZJ3RJW/