Bug 1618861 – CVE-2018-15836 openswan: Improper signature verification in try_RSA_signature_v2() fucntion for RSASSA-PKCS1-v1_5 signature scheme

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Bug 1618861 - (CVE-2018-15836) CVE-2018-15836 openswan: Improper signature verification in try_RSA_signature_v2() fucntion for RSASSA-PKCS1-v1_5 signature scheme

Summary:	CVE-2018-15836 openswan: Improper signature verification in try_RSA_signature...

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-15836

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=moderate,public=20180817,repor...
Keywords:	Security

Depends On:
Blocks:	1618862
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Reported:	2018-08-17 16:05 EDT by Pedro Sampaio
Modified:	2018-09-27 23:18 EDT (History)
CC List:	1 user (show)

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Last Closed:	2018-08-19 23:04:45 EDT
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Description Pedro Sampaio 2018-08-17 16:05:38 EDT

A flaw was found in openswan v2.6.50. Improper signature verification for RSASSA-PKCS1-v1_5 signature scheme in the try_RSA_signature_v2() function may leave it open to Bleichenbacher-style signature forgery attacks.

Upstream patch:

https://github.com/xelerance/Openswan/pull/317#issuecomment-413738632

References:

https://lists.openswan.org/pipermail/users/2018-August/023758.html

Comment 1 Paul Wouters 2018-08-17 16:36:14 EDT

note this flaw only affects openswan versions compiled without NSS. When NSS is used as cryptographic library, the RSA routines from NSS are used instead of the custom openswan RSA code that contains the vulnerability.

RHEL has only ever shipped with NSS enabled openswan versions, so no Red Hat products are vulnerable to this bug.

Comment 2 Doran Moppert 2018-08-19 23:04:52 EDT

Statement:

This flaw only affects openswan versions compiled without NSS. When NSS is used as cryptographic library, the RSA routines from NSS are used instead of the custom openswan RSA code that contains the vulnerability.

Red Hat Enterprise Linux has only ever shipped with NSS enabled openswan versions, so no Red Hat products are vulnerable to this bug.

Comment 3 Sam Fowler 2018-09-27 23:18:45 EDT

Upstream Advisory:

https://lists.openswan.org/pipermail/users/2018-August/023761.html


Upstream Patch:

https://github.com/xelerance/Openswan/commit/9eaa6c2a823c1d2b58913506a15f9474bf857a3d#diff-4fcbf41f558919d3296802fad6dce5a3

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