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[ GLSA 201209-12 ] Libtasn1: Denial of Service
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PostPosted: Tue Sep 25, 2012 11:26 pm    Post subject: [ GLSA 201209-12 ] Libtasn1: Denial of Service Reply with quote

Gentoo Linux Security Advisory

Title: Libtasn1: Denial of Service (GLSA 201209-12)
Severity: normal
Exploitable: remote
Date: September 25, 2012
Bug(s): #409031
ID: 201209-12

Synopsis

A vulnerability in Libtasn1 might cause a Denial of Service
condition.


Background

Libtasn1 is a library used to parse ASN.1 (Abstract Syntax Notation One)
objects, and perform DER (Distinguished Encoding Rules) decoding.


Affected Packages

Package: dev-libs/libtasn1
Vulnerable: < 2.12
Unaffected: >= 2.12
Architectures: All supported architectures


Description

Libtasn1 does not properly handle length fields when performing DER
decoding.


Impact

A remote attacker could entice a user to open a specially crafted
DER-encoded object in an application linked against Libtasn1, possibly
resulting in Denial of Service.


Workaround

There is no known workaround at this time.

Resolution

All Libtasn1 users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/libtasn1-2.12"
   
Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying some of these packages.


References

CVE-2012-1569
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