m2crypto: OpenSSL incorrect checks for malformed signatures
Published Jan 15, 2009
5.0
MEDIUMCVSS 2.0
EPSS 1.38%
Description
M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077. NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because "these functions are not used anywhere in m2crypto.
Affected products
No data.
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat does not consider this to be a security issue. M2Crypto provides python interfaces to multiple OpenSSL functions. Neither of those interfaces is further used by M2Crypto in an insecure way. Additionally, no application shipped in Red Hat Enterprise Linux is known to use affected interfaces provided by M2Crypto. Further details can be found in the following bug report: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-0127#c1
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.38% (0.01379) | 71.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.38% (0.01379) | 68.44th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.08% (0.00083) | 21.76th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.32% (0.00320) | 71.42th | v3 (v2023.03.01) |
| Apr 25, 2024 | 0.28% (0.00276) | 67.77th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.25% (0.00249) | 64.11th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.23% (0.00228) | 60.03th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.32% (0.00320) | 65.84th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
References (6)
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511515 x_refsource_MISCThird Party Advisory
- http://openwall.com/lists/oss-security/2009/01/12/4 mailing-listx_refsource_MLISTMailing List
- https://access.redhat.com/security/cve/CVE-2009-0127 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=479676 x_refsource_MISCExploitIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-0127
- https://www.cve.org/CVERecord?id=CVE-2009-0127
| Link | Providers | Tags |
|---|---|---|
| http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511515 | x_refsource_MISCThird Party Advisory | |
| http://openwall.com/lists/oss-security/2009/01/12/4 | mailing-listx_refsource_MLISTMailing List | |
| https://access.redhat.com/security/cve/CVE-2009-0127 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=479676 | x_refsource_MISCExploitIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2009-0127 | ||
| https://www.cve.org/CVERecord?id=CVE-2009-0127 |
Change history (0)
No recorded changes yet.