GNU Libtasn1 up to 3.5 lib/decoding.c null pointer dereference

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7.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in GNU Libtasn1 up to 3.5. This issue affects the function asn1_get_tag_der/_asn1_get_indefinite_length_string/asn1_der_decoding/asn1_der_decoding_startEnd/_asn1_extract_tag_der/_asn1_get_octet_string/_asn1_extract_der_octet/_asn1_get_time_der in the library lib/decoding.c. Performing a manipulation results in null pointer dereference. This vulnerability was named CVE-2014-3467. There is no available exploit. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in GNU Libtasn1 up to 3.5. This affects the function asn1_get_tag_der/_asn1_get_indefinite_length_string/asn1_der_decoding/asn1_der_decoding_startEnd/_asn1_extract_tag_der/_asn1_get_octet_string/_asn1_extract_der_octet/_asn1_get_time_der in the library lib/decoding.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Multiple unspecified vulnerabilities in the DER decoder in GNU Libtasn1 before 3.6, as used in GnuTLS, allow remote attackers to cause a denial of service (out-of-bounds read) via crafted ASN.1 data.

The weakness was presented 05/25/2014 by Tomas Hoger as GNU Libtasn1 3.6 released as confirmed posting (Mailing List). The advisory is shared at lists.gnu.org. This vulnerability is uniquely identified as CVE-2014-3467 since 05/14/2014. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 74298 (Oracle Linux 6 : libtasn1 (ELSA-2014-0596)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 167234 (SUSE Enterprise Linux Security Update for GnuTLS (SUSE-SU-2014:0788-1)).

Upgrading to version 3.6 eliminates this vulnerability. The upgrade is hosted for download at ftp.gnu.org. Applying a patch is able to eliminate this problem. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (93535), Tenable (74298), SecurityFocus (BID 67749†), Secunia (SA58379†) and SecurityTracker (ID 1030313†). See VDB-13407, VDB-13415 and VDB-13414 for similar entries. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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CPE 2.3info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 74298
Nessus Name: Oracle Linux 6 : libtasn1 (ELSA-2014-0596)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 703056
OpenVAS Name: Debian Security Advisory DSA 3056-1 (libtasn1-3 - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Libtasn1 3.6

Timelineinfo

05/14/2014 🔍
05/25/2014 +11 days 🔍
05/25/2014 +0 days 🔍
05/25/2014 +0 days 🔍
05/25/2014 +0 days 🔍
06/02/2014 +8 days 🔍
06/02/2014 +0 days 🔍
06/02/2014 +0 days 🔍
06/04/2014 +2 days 🔍
06/05/2014 +1 days 🔍
06/08/2014 +3 days 🔍
06/20/2021 +2569 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: GNU Libtasn1 3.6 released
Researcher: Tomas Hoger
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-3467 (🔍)
GCVE (CVE): GCVE-0-2014-3467
GCVE (VulDB): GCVE-100-13413

OVAL: 🔍

X-Force: 93535 - GNU libtasn1 decoding.c denial of service, Medium Risk
SecurityFocus: 67749 - GNU Libtasn1 CVE-2014-3467 Multiple Denial of Service Vulnerabilities
Secunia: 58379 - libtasn1 Multiple Vulnerabilities, Less Critical
SecurityTracker: 1030313 - libtASN1 Multiple Bugs Let Remote Users Deny Service
Vulnerability Center: 44800 - GnuTLS <3.6 Remote DoS vulnerability in libtasn1 via Crafted ASN.1, Medium

See also: 🔍

Entryinfo

Created: 06/02/2014 21:38
Updated: 06/20/2021 14:24
Changes: 06/02/2014 21:38 (79), 05/30/2017 09:14 (14), 06/20/2021 14:24 (3)
Complete: 🔍
Cache ID: 216:85B:103

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