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5.0

OpenSSL may freeze when processing malformed S/MIME messages

CVE-2015-1792 · published 11 years ago
Summary

Certain older versions of OpenSSL can get stuck in an endless loop when they receive specially crafted S/MIME data that includes an unknown hash identifier. This can cause the affected system to stop responding, effectively a denial of service. Upgrade OpenSSL to a version newer than 0.9.8zg, 1.0.0s, 1.0.1n, or 1.0.2b, or apply the vendor's patch to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
openssl openssl <= 0.9.8zf
1.0.0
1.0.0a
1.0.0b
1.0.0c
1.0.0d
1.0.0e
1.0.0f
1.0.0g
1.0.0h
1.0.0i
1.0.0j
24 more version ranges
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Original advisory text
The do_free_upto function in crypto/cms/cms_smime.c in OpenSSL before 0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b allows remote attackers to cause a denial of service...
The do_free_upto function in crypto/cms/cms_smime.c in OpenSSL before 0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b allows remote attackers to cause a denial of service (infinite loop) via vectors that trigger a NULL value of a BIO data structure, as demonstrated by an unrecognized X.660 OID for a hash function.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.0 Medium
Exploitation
23% chance of attack within 30 days
Type
CWE-399Resource Management Errors
Timeline
Published12 Jun 2015
Updated24 Oct 2026
First seen29 Sep 2026
Sources
CVE-2015-1792 · NVD
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