CVE-2013-0176: Null Pointer Dereference
First published: Tue Feb 05 2013(Updated: )
The publickey_from_privatekey function in libssh before 0.5.4, when no algorithm is matched during negotiations, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a "Client: Diffie-Hellman Key Exchange Init" packet.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Ubuntu | <=0.5.3 | |
| Ubuntu | =0.4.7 | |
| Ubuntu | =0.4.8 | |
| Ubuntu | =0.5.0 | |
| Ubuntu | =0.5.0-rc1 | |
| Ubuntu | =0.5.1 | |
| Ubuntu | =0.5.2 |
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Reference Links
- http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098065.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098094.html
- http://secunia.com/advisories/51982
- http://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/
- http://www.ubuntu.com/usn/USN-1707-1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/81595
Frequently Asked Questions
What is the severity of CVE-2013-0176?
CVE-2013-0176 has a severity rating of medium due to its potential for denial of service.
How do I fix CVE-2013-0176?
To fix CVE-2013-0176, upgrade to libssh version 0.5.4 or newer.
What systems are affected by CVE-2013-0176?
CVE-2013-0176 affects libssh versions prior to 0.5.4, specifically versions 0.4.7, 0.4.8, 0.5.0, 0.5.1, and 0.5.2.
What causes the vulnerability in CVE-2013-0176?
CVE-2013-0176 is caused by a NULL pointer dereference when no algorithm is matched during the key exchange negotiations.
Can CVE-2013-0176 be exploited remotely?
Yes, CVE-2013-0176 can be exploited remotely through specially crafted 'Client: Diffie-Hellman Key Exchange Init' packets.
- agent/references
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/weakness
- agent/last-modified-date
- agent/remedy
- agent/author
- agent/severity
- agent/description
- agent/event
- agent/first-publish-date
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/libssh
- canonical/ubuntu
- version/ubuntu/0.5.3
- version/ubuntu/0.4.7
- version/ubuntu/0.4.8
- version/ubuntu/0.5.0
- version/ubuntu/0.5.0-rc1
- version/ubuntu/0.5.1
- version/ubuntu/0.5.2