Bug 1202345 (CVE-2015-0290) - CVE-2015-0290 openssl: multiblock corrupted pointer
Summary: CVE-2015-0290 openssl: multiblock corrupted pointer
Alias: CVE-2015-0290
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On:
Blocks: 1202442
TreeView+ depends on / blocked
Reported: 2015-03-16 12:53 UTC by Martin Prpič
Modified: 2023-05-12 08:12 UTC (History)
48 users (show)

Fixed In Version: openssl 1.0.2a
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2015-03-18 03:43:00 UTC

Attachments (Terms of Use)

Description Martin Prpič 2015-03-16 12:53:35 UTC
OpenSSL 1.0.2 introduced the "multiblock" performance improvement. This feature only applies on 64-bit x86 architecture platforms that support AES NI instructions. A defect in the implementation of "multiblock" can cause OpenSSL's internal write buffer to become incorrectly set to NULL when using non-blocking I/O. Typically, when the user application is using a socket BIO for writing, this will only result in a failed connection. However if some other BIO is used, then it is likely that a segmentation fault will be triggered, thus enabling a potential denial of service attack.

This issue affects OpenSSL version 1.0.2, and is fixed in version 1.0.2a.


Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Daniel Danner and Rainer Mueller as the original reporters.

Comment 1 Huzaifa S. Sidhpurwala 2015-03-18 03:43:00 UTC

This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 5, 6, and 7.

Comment 2 Tomas Hoger 2015-03-18 14:05:34 UTC
Affected code was introduced upstream in 1.0.2 via:


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