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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
gzip: Multiple vulnerabilities
Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200609-13
(gzip: Multiple vulnerabilities)
Tavis Ormandy of the Google Security Team has reported multiple
vulnerabilities in gzip. A stack buffer modification vulnerability was
discovered in the LZH decompression code, where a pathological data
stream may result in the modification of stack data such as frame
pointer, return address or saved registers. A static buffer underflow
was discovered in the pack decompression support, permiting a specially
crafted pack archive to underflow a .bss buffer. A static buffer
overflow was uncovered in the LZH decompression code, permiting a data
stream consisting of pathological huffman codes to overflow a .bss
buffer. Multiple infinite loops were also uncovered in the LZH
A remote attacker may create a specially crafted gzip archive, which
when decompressed by a user or automated system exectues arbitrary code
with the rights of the user id invoking gzip. The infinite loops
may be abused by a possible hacker to disrupt any automated systems invoking
gzip to handle data decompression.
There is no known workaround at this time.
All gzip users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/gzip-1.3.5-r9"
Network Security Threat Level: Medium
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2006 Michel Arboi
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