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Bug 723846 (CVE-2018-0739) - [Tracker] ASN.1 parsing vulnerability (CVE-2018-0739)
Summary: [Tracker] ASN.1 parsing vulnerability (CVE-2018-0739)
Alias: CVE-2018-0739
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Whiteboard: A3 [cve]
Depends on: CVE-2018-0733 CVE-2018-12437
  Show dependency tree
Reported: 2020-05-18 21:30 UTC by Sam James
Modified: 2020-07-29 23:47 UTC (History)
0 users

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Runtime testing required: ---


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Description Sam James archtester gentoo-dev Security 2020-05-18 21:30:59 UTC
Constructed ASN.1 types with a recursive definition could exceed the stack (CVE-2018-0739)

Severity: Moderate

Constructed ASN.1 types with a recursive definition (such as can be found in
PKCS7) could eventually exceed the stack given malicious input with
excessive recursion. This could result in a Denial Of Service attack. There are
no such structures used within SSL/TLS that come from untrusted sources so this
is considered safe.

OpenSSL 1.1.0 users should upgrade to 1.1.0h
OpenSSL 1.0.2 users should upgrade to 1.0.2o

This issue was reported to OpenSSL on 4th January 2018 by the OSS-fuzz project.
The fix was developed by Matt Caswell of the OpenSSL development team.
Comment 1 Sam James archtester gentoo-dev Security 2020-05-18 21:37:58 UTC
Please note that this is *not* a new issue in OpenSSL; this tracker is so we can use the CVE for libtomcrypt / dropbear too.