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Bug 30001 - dev-libs/openssl Vulnerabilities in ASN.1 parsing
Summary: dev-libs/openssl Vulnerabilities in ASN.1 parsing
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Highest critical (vote)
Assignee: Gentoo Security
: 29999 30043 (view as bug list)
Depends on:
Reported: 2003-09-30 07:56 UTC by Daniel Ahlberg (RETIRED)
Modified: 2011-10-30 22:40 UTC (History)
6 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Daniel Ahlberg (RETIRED) gentoo-dev 2003-09-30 07:56:20 UTC
OpenSSL Security Advisory [30 September 2003]

Vulnerabilities in ASN.1 parsing

NISCC ( prepared a test suite to check the operation
of SSL/TLS software when presented with a wide range of malformed client

Dr Stephen Henson ( of the OpenSSL core team
identified and prepared fixes for a number of vulnerabilities in the
OpenSSL ASN1 code when running the test suite.

A bug in OpenSSLs SSL/TLS protocol was also identified which causes
OpenSSL to parse a client certificate from an SSL/TLS client when it
should reject it as a protocol error.


1. Certain ASN.1 encodings that are rejected as invalid by the parser
can trigger a bug in the deallocation of the corresponding data
structure, corrupting the stack. This can be used as a denial of service
attack. It is currently unknown whether this can be exploited to run
malicious code. This issue does not affect OpenSSL 0.9.6.

2. Unusual ASN.1 tag values can cause an out of bounds read under
certain circumstances, resulting in a denial of service vulnerability.

3. A malformed public key in a certificate will crash the verify code if
it is set to ignore public key decoding errors. Public key decode errors
are not normally ignored, except for debugging purposes, so this is
unlikely to affect production code. Exploitation of an affected
application would result in a denial of service vulnerability.

4. Due to an error in the SSL/TLS protocol handling, a server will parse
a client certificate when one is not specifically requested. This by
itself is not strictly speaking a vulnerability but it does mean that
*all* SSL/TLS servers that use OpenSSL can be attacked using
vulnerabilities 1, 2 and 3 even if they don't enable client authentication.

Who is affected?

All versions of OpenSSL up to and including 0.9.6j and 0.9.7b and all
versions of SSLeay are affected.

Any application that makes use of OpenSSL's ASN1 library to parse
untrusted data. This includes all SSL or TLS applications, those using
S/MIME (PKCS#7) or certificate generation routines.


Upgrade to OpenSSL 0.9.7c or 0.9.6k. Recompile any OpenSSL applications
statically linked to OpenSSL libraries.


The Common Vulnerabilities and Exposures project ( has
assigned the name CAN-2003-0545 for issue 1:

and CAN-2003-0543 and CAN-2003-0544 for issue 2:

URL for this Security Advisory:
Comment 1 Rajiv Aaron Manglani (RETIRED) gentoo-dev 2003-09-30 08:34:14 UTC
*** Bug 29999 has been marked as a duplicate of this bug. ***
Comment 2 solar (RETIRED) gentoo-dev 2003-09-30 13:28:54 UTC
New ebuilds in portage.. Please test.
Comment 3 solar (RETIRED) gentoo-dev 2003-09-30 17:07:57 UTC
GMSoft of the hppa herd confirmed that openssl 0.9.7c compiles and links
fine and he plans to mark stable if now error show up in the new few days.
Kumba verified that openssl compiles and links fine on sparc64 (but fails
with -fstack-protector enabled sparc32 & sparc64)
<rac> solar: openssl 0.9.7c works on amd64 - i can restart sshd and login
via ssh afterwards

I requested that rac mark openssl stable for amd64 when he feels its ready.
<bazik> solar: oh btw, my cflags are CFLAGS="-mcpu=ultrasparc -mtune=ultrasparc
-O3 -pipe -fomit-frame-pointer"

verified works on sparc without fstack-protector.
Comment 4 solar (RETIRED) gentoo-dev 2003-09-30 22:18:58 UTC
*** Bug 30043 has been marked as a duplicate of this bug. ***
Comment 5 solar (RETIRED) gentoo-dev 2003-10-01 08:26:14 UTC

changing resolution to FIXED
Comment 6 solar (RETIRED) gentoo-dev 2003-10-01 08:49:21 UTC
changing resolution to FIXED again.