A denial of service flaw was found in the way OpenSSL verified certain signed messages using CMS (Cryptographic Message Syntax). A remote attacker could cause an application using OpenSSL to use excessive amounts of memory by sending a specially crafted message for verification.
The following was reported by OpenSSL upstream:
When verifying a signedData message the CMS code can enter an infinite loop if presented with an unknown hash function OID.
This can be used to perform denial of service against any system which verifies signedData messages using the CMS code.
This issue affects all current OpenSSL versions: 1.0.2, 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 1.0.2 users should upgrade to 1.0.2b
OpenSSL 1.0.1 users should upgrade to 1.0.1n
OpenSSL 1.0.0 users should upgrade to 1.0.0s
OpenSSL 0.9.8 users should upgrade to 0.9.8zg
This issue was reported to OpenSSL on 31st March 2015 by Johannes Bauer. The fix was developed by Dr. Stephen Henson of the OpenSSL development team.
Red Hat would like to thank the OpenSSL project for reporting this issue.
Created attachment 1035154 [details]
Proposed patch for CVE-2015-1792
Created openssl tracking bugs for this issue:
Affects: fedora-all [bug 1231051]
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Via RHSA-2015:1115 https://rhn.redhat.com/errata/RHSA-2015-1115.html
This issue does NOT affect the version of OpenSSL package as shipped with Red Hat Enterprise Linux 5.
openssl-1.0.1k-10.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
openssl-1.0.1k-10.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.