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CVE-2024-4603

Published: 16 May 2024

Issue summary: Checking excessively long DSA keys or parameters may be very slow. Impact summary: Applications that use the functions EVP_PKEY_param_check() or EVP_PKEY_public_check() to check a DSA public key or DSA parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The functions EVP_PKEY_param_check() or EVP_PKEY_public_check() perform various checks on DSA parameters. Some of those computations take a long time if the modulus (`p` parameter) is too large. Trying to use a very large modulus is slow and OpenSSL will not allow using public keys with a modulus which is over 10,000 bits in length for signature verification. However the key and parameter check functions do not limit the modulus size when performing the checks. An application that calls EVP_PKEY_param_check() or EVP_PKEY_public_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. These functions are not called by OpenSSL itself on untrusted DSA keys so only applications that directly call these functions may be vulnerable. Also vulnerable are the OpenSSL pkey and pkeyparam command line applications when using the `-check` option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.

Notes

AuthorNote
Priority reason:
Upstream OpenSSL project has rated this a being a low severity issue
mdeslaur
per upstream, 3.x only

Priority

Low

Status

Package Release Status
edk2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(openssl 3.x only)
focal Not vulnerable
(openssl 3.x only)
jammy Not vulnerable
(openssl 3.x only)
mantic Not vulnerable
(openssl 3.x only)
noble Needed

upstream Needs triage

xenial Not vulnerable
(openssl 3.x only)
nodejs
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Not vulnerable
(uses system openssl)
jammy Needed

mantic Not vulnerable
(uses system openssl)
noble Not vulnerable
(uses system openssl)
trusty Not vulnerable
(uses system openssl)
upstream Needs triage

xenial Needs triage

openssl
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(3.x only)
focal Not vulnerable
(3.x only)
jammy Needed

mantic Ignored
(end of life, was needed)
noble Needed

trusty Not vulnerable
(3.x only)
upstream Needs triage

xenial Not vulnerable
(3.x only)
Patches:
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=3559e868e58005d15c6013a0c1fd832e51c73397
openssl1.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(3.x only)
focal Does not exist

jammy Does not exist

mantic Does not exist

noble Does not exist

upstream Needs triage