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Files Date: 2021-06-21

Ubuntu Security Notice USN-4994-1
Posted Jun 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4994-1 - Marc Stern discovered that the Apache mod_proxy_http module incorrectly handled certain requests. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. Antonio Morales discovered that the Apache mod_auth_digest module incorrectly handled certain Digest nonces. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2020-13950, CVE-2020-35452, CVE-2021-26690, CVE-2021-26691, CVE-2021-30641
SHA-256 | a72dd26c36ff7d43b1a3ccbd95cb1d69d70e997aaac6217677f1cd3536ba61f6
Ubuntu Security Notice USN-4993-1
Posted Jun 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4993-1 - Kirin discovered that Dovecot incorrectly escaped kid and azp fields in JWT tokens. A local attacker could possibly use this issue to validate tokens using arbitrary keys. This issue only affected Ubuntu 20.10 and Ubuntu 21.04. Fabian Ising and Damian Poddebniak discovered that Dovecot incorrectly handled STARTTLS when using the SMTP submission service. A remote attacker could possibly use this issue to inject plaintext commands before STARTTLS negotiation. Various other issues were also addressed.

tags | advisory, remote, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2021-29157, CVE-2021-33515
SHA-256 | 8070e4ff7c7ad7153e26bd392db955c947c13d14fa02d99a329da78fe2c25836
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