USN-4738-1: OpenSSL vulnerabilities
18 February 2021
Several security issues were fixed in OpenSSL.
Releases
Packages
- openssl - Secure Socket Layer (SSL) cryptographic library and tools
- openssl1.0 - Secure Socket Layer (SSL) cryptographic library and tools
Details
Paul Kehrer discovered that OpenSSL incorrectly handled certain input
lengths in EVP functions. A remote attacker could possibly use this issue
to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2021-23840)
Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer
fields. A remote attacker could possibly use this issue to cause OpenSSL to
crash, resulting in a denial of service. (CVE-2021-23841)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
Related notices
- USN-4745-1: libssl1.0.0, libssl-doc, openssl, libssl-dev, libssl1.0.0-udeb, libcrypto1.0.0-udeb
- USN-5088-1: ovmf-ia32, qemu-efi-aarch64, ovmf, edk2, qemu-efi-arm, qemu-efi
- USN-7018-1: libssl1.0.0, libssl-doc, openssl, libssl-dev