Vulnerability-Lookup

RHSA-2011:0871

Vulnerability from csaf_redhat - Published: 2011-06-15 10:05 - Updated: 2026-06-25 10:37

Summary

Red Hat Security Advisory: tigervnc security update

Severity

Moderate

Notes

Topic: Updated tigervnc packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Details: Virtual Network Computing (VNC) is a remote display system which allows you to view a computer's desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients. It was discovered that vncviewer could prompt for and send authentication credentials to a remote server without first properly validating the server's X.509 certificate. As vncviewer did not indicate that the certificate was bad or missing, a man-in-the-middle attacker could use this flaw to trick a vncviewer client into connecting to a spoofed VNC server, allowing the attacker to obtain the client's credentials. (CVE-2011-1775) All tigervnc users should upgrade to these updated packages, which contain a backported patch to correct this issue.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2011-1775

The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verify the server's X.509 certificate, which allows man-in-the-middle attackers to spoof a TLS VNC server via an arbitrary certificate.

2.6 ()


                
                  AV:N/AC:H/Au:N/C:P/I:N/A:N

Affected products

Fixed 21 products

Product	Version	Remediation
Unresolved product id: 6Server-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.s390x	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.src	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.s390x	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-server-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-server-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-server-0:1.0.90-0.15.20110314svn4359.el6_1.1.s390x	—	Vendor Fix fix
Unresolved product id: 6Server-6.1.z:tigervnc-server-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.src	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-server-applet-0:1.0.90-0.15.20110314svn4359.el6_1.1.noarch	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-server-module-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-server-module-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64	—	Vendor Fix fix
Unresolved product id: 6Server-optional-6.1.z:tigervnc-server-module-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64	—	Vendor Fix fix

Threats

Impact Moderate

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2011:0871	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=702470	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2011-1775	self
https://bugzilla.redhat.com/show_bug.cgi?id=702470	external
https://www.cve.org/CVERecord?id=CVE-2011-1775	external
https://nvd.nist.gov/vuln/detail/CVE-2011-1775	external

JSON

To clipboard

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            "6Server-6.1.z:tigervnc-server-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64",
            "6Server-optional-6.1.z:tigervnc-0:1.0.90-0.15.20110314svn4359.el6_1.1.src",
            "6Server-optional-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686",
            "6Server-optional-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64",
            "6Server-optional-6.1.z:tigervnc-debuginfo-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64",
            "6Server-optional-6.1.z:tigervnc-server-applet-0:1.0.90-0.15.20110314svn4359.el6_1.1.noarch",
            "6Server-optional-6.1.z:tigervnc-server-module-0:1.0.90-0.15.20110314svn4359.el6_1.1.i686",
            "6Server-optional-6.1.z:tigervnc-server-module-0:1.0.90-0.15.20110314svn4359.el6_1.1.ppc64",
            "6Server-optional-6.1.z:tigervnc-server-module-0:1.0.90-0.15.20110314svn4359.el6_1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tigervnc: vncviewer can send password to server without proper validation of the X.509 certificate"
    }
  ]
}

CVE-2011-1775 (GCVE-0-2011-1775)

Vulnerability from cvelistv5 – Published: 2011-05-26 18:00 – Updated: 2024-08-06 22:37

Summary

Severity

No CVSS data available.

CWE

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1131 records in the last 180 days details

References

11 references

URL	Tags
http://openwall.com/lists/oss-security/2011/05/06/2	mailing-listx_refsource_MLIST
http://openwall.com/lists/oss-security/2011/05/09/7	mailing-listx_refsource_MLIST
http://www.mail-archive.com/tigervnc-devel%40list…	mailing-listx_refsource_MLIST
http://www.mail-archive.com/tigervnc-devel%40list…	mailing-listx_refsource_MLIST
https://bugzilla.redhat.com/show_bug.cgi?id=702672	x_refsource_CONFIRM
http://lists.fedoraproject.org/pipermail/package-…	vendor-advisoryx_refsource_FEDORA
https://bugzilla.redhat.com/show_bug.cgi?id=702470	x_refsource_CONFIRM
http://www.redhat.com/support/errata/RHSA-2011-08…	vendor-advisoryx_refsource_REDHAT
http://secunia.com/advisories/44939	third-party-advisoryx_refsource_SECUNIA
http://www.securityfocus.com/bid/47738	vdb-entryx_refsource_BID
http://www.mail-archive.com/tigervnc-devel%40list…	mailing-listx_refsource_MLIST

Date Public

2011-05-04 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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