Security Features in OpenSSL - CVE-2015-1793
Published: July 9, 2015 / Updated: August 3, 2020
Vulnerability identifier: #VU33290
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-1793
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.
Affected software
OpenSSL
Amazon Linux AMI
Gentoo Linux
Slackware Linux
Fedora
openssl (Alpine package)
openssl
Cloud Service Automation (CSA)
Amazon Linux AMI
Gentoo Linux
Slackware Linux
Fedora
openssl (Alpine package)
openssl
Cloud Service Automation (CSA)
How to mitigate CVE-2015-1793
Install update from vendor's website.
OpenSSL - update to 1.0.1o
openssl (Alpine package) - update to 1.0.1p-r0
Cloud Service Automation (CSA) - update to 4.5.0.1
openssl - addressed in versions 1.0.1k-11.fc21, 1.0.1k-11.fc22
openssl (Alpine package) - update to 1.0.1p-r0
Cloud Service Automation (CSA) - update to 4.5.0.1
openssl - addressed in versions 1.0.1k-11.fc21, 1.0.1k-11.fc22
External References
- http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
- http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694
- http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html
- http://marc.info/?l=bugtraq&m=143880121627664&w=2
- http://marc.info/?l=bugtraq&m=144370846326989&w=2
- http://openssl.org/news/secadv_20150709.txt
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl
- http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
- http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- http://www.securityfocus.com/bid/75652
- http://www.securityfocus.com/bid/91787
- http://www.securitytracker.com/id/1032817
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.561427
- http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-454058.htm
- https://git.openssl.org/?p=openssl.git;a=commit;h=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04822825
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351
- https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes
- https://kc.mcafee.com/corporate/index?page=content&id=SB10125
- https://security.gentoo.org/glsa/201507-15
- https://www.exploit-db.com/exploits/38640/
- https://www.freebsd.org/security/advisories/FreeBSD-SA-15:12.openssl.asc