certfr_avis - certfr-2020-avi-803

CERTFR-2020-AVI-803

Vulnerability from certfr_avis

Une vulnérabilité a été découverte dans OpenSSL. Elle permet à un attaquant de provoquer un déni de service à distance.

Solution

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

OpenSSL 1.1.x versions antérieures à 1.1.1i
OpenSSL 1.0.2 versions antérieures à 1.0.2x (nécessite un contrat de support spécifique)

Les versions antérieures d'OpenSSL sont potentiellement affectées, l'éditeur n'a pas effectué de vérification sur ces versions.

Impacted products

	Vendor	Product	Description

References

Title

Publication Time

CVE-2020-1971 (GCVE-0-2020-1971)

Vulnerability from cvelistv5

Published

2020-12-08 15:30

Modified

2024-09-17 02:57

Severity ?

CWE

NULL pointer dereference

Summary

The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the "-crl_download" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).

References

URL

Tags

	https://www.openssl.org/news/secadv/20201208.txt
	https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f960d81215ebf3f65e03d4d5d857fb9b666d6920
	https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2154ab83e14ede338d2ede9bbe5cdfce5d5a6c9e
	https://www.debian.org/security/2020/dsa-4807	vendor-advisory
	https://security.FreeBSD.org/advisories/FreeBSD-SA-20:33.openssl.asc	vendor-advisory
	https://lists.debian.org/debian-lts-announce/2020/12/msg00021.html	mailing-list
	https://lists.debian.org/debian-lts-announce/2020/12/msg00020.html	mailing-list
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DGSI34Y5LQ5RYXN4M2I5ZQT65LFVDOUU/	vendor-advisory
	https://lists.apache.org/thread.html/rbb769f771711fb274e0a4acb1b5911c8aab544a6ac5e8c12d40c5143%40%3Ccommits.pulsar.apache.org%3E	mailing-list
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PWPSSZNZOBJU2YR6Z4TGHXKYW3YP5QG7/	vendor-advisory
	https://security.gentoo.org/glsa/202012-13	vendor-advisory
	https://www.oracle.com/security-alerts/cpujan2021.html
	https://www.tenable.com/security/tns-2020-11
	https://security.netapp.com/advisory/ntap-20201218-0005/
	https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44676
	https://lists.apache.org/thread.html/r63c6f2dd363d9b514d0a4bcf624580616a679898cc14c109a49b750c%40%3Cdev.tomcat.apache.org%3E	mailing-list
	https://www.oracle.com/security-alerts/cpuApr2021.html
	https://www.tenable.com/security/tns-2021-10
	https://www.tenable.com/security/tns-2021-09
	https://security.netapp.com/advisory/ntap-20210513-0002/
	https://www.oracle.com//security-alerts/cpujul2021.html
	http://www.openwall.com/lists/oss-security/2021/09/14/2	mailing-list
	https://www.oracle.com/security-alerts/cpuoct2021.html
	https://www.oracle.com/security-alerts/cpuapr2022.html
	https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
	https://security.netapp.com/advisory/ntap-20240621-0006/

Impacted products

	Vendor	Product	Version
	OpenSSL	OpenSSL	Version: Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h) Version: Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)

Show details on NVD website

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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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