CVE-2020-1967
Published: 21 April 2020
Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).
Notes
| Author | Note |
|---|---|
| mdeslaur | introduced in 1.1.1d |
Priority
High
CVSS 3 base score: 7.5
Status
| Package | Release | Status |
|---|---|---|
|
edk2 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| eoan |
Not vulnerable
(code not present)
|
|
| focal |
Not vulnerable
(code not compiled)
|
|
| precise |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
openssl Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| eoan |
Not vulnerable
(code not present)
|
|
| focal |
Released
(1.1.1f-1ubuntu2)
|
|
| precise |
Not vulnerable
(code not present)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(1.1.1g)
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
Patches: upstream: https://github.com/openssl/openssl/commit/a87f3fe01a5a894aa27ccd6a239155fd129988e4 upstream: https://github.com/openssl/openssl/commit/3656c08ab4b1b892730cb5e808b6f4298b08a2e6 |
||
|
openssl1.0 Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| eoan |
Does not exist
|
|
| focal |
Does not exist
|
|
| precise |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|