62943 : WebKit HTMLParser::handleResidualStyleCloseTagAcrossBlocks Misnested Residual Style Tags Handling Use-after-free Issue
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Views This Week Views All Time Added to OSVDB Last Modified Modified (since 2008) Percent Complete
1 983 about 4 years ago about 1 year ago 24 times 80%


Disclosure Date
Time to Patch
47 days


WebKit contains a use-after-free error in the 'HTMLParser::handleResidualStyleCloseTagAcrossBlocks' function in WebCore/html/HTMLParser.cpp when handling misnested residual style tags. With a specially crafted web page, a context-dependent attacker can dereference already freed memory and potentially execute arbitrary code.


Location: Context Dependent
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Upgrade
Exploit: PoC Public
Disclosure: Vendor Verified, Coordinated Disclosure
OSVDB: Web Related


It has been reported that this issue has been fixed. Upgrade to version 1.2.0, or higher, to address this vulnerability.

Upgrade to Apple Safari version 4.0.5 or higher, as it has been reported to fix this vulnerability. The vulnerability may also have been silently fixed in Google Chrome version An upgrade is required as there are no known workarounds.


Unknown or Incomplete


Tools & Filters



CVSSv2 Score

CVSSv2 Base Score = 9.3
Source: nvd.nist.gov | Generated: 2010-03-15 | Disagree?

Access_vector_2 Access_complexity_1 Authentication_2 Confidentiality_impact_2 Integrity_impact_2 Availability_impact_2


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