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Overview

Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity via the computeAllFrames method in MethodWriter. An attacker can exhaust CPU and tie up class-file transformation threads for an unbounded time by supplying crafted class files for processing with ClassWriter.COMPUTE_FRAMES; their methods make frame computation’s fixpoint algorithm converge slowly.

Remediation

Upgrade org.ow2.asm:asm to version 9.11 or higher.

References

• GitLab Commit
• gitlab.ow2.org
• gitlab.ow2.org
• Red Hat Bugzilla Bug

Overview

Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity via the computeAllFrames() and computeMaxStackAndLocal() methods in MethodWriter. When ASM processes a crafted class file with thousands of overlapping exception handlers using COMPUTE_FRAMES or COMPUTE_MAXS, it allocates excessive Edge objects, causing an OutOfMemoryError that crashes the JVM.

Remediation

Upgrade org.ow2.asm:asm to version 9.11 or higher.

References

• GitLab Commit
• gitlab.ow2.org
• gitlab.ow2.org
• Red Hat Bugzilla Bug

Overview

Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value via readBootstrapMethodsAttribute() in ClassReader. When an application parses an attacker-supplied class file, a crafted BootstrapMethods attribute with an unchecked declared length can trigger an allocation of roughly 2 GB from a file of about 100 bytes, causing an OutOfMemoryError that crashes the JVM or the thread processing the class.

Remediation

Upgrade org.ow2.asm:asm to version 9.11 or higher.

References

• GitLab Commit
• gitlab.ow2.org
• gitlab.ow2.org
• Red Hat Bugzilla Bug

Overview

Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value via the addSubroutineRetSuccessors() method in the Label class. An attacker can crash the JVM by supplying a crafted invalid class file with multiple RET instructions for one JSR while ASM processes the subroutine.

Notes

• The attacker must get a user to load or process the crafted class file.

Remediation

Upgrade org.ow2.asm:asm to version 9.11 or higher.

References

• GitLab Commit
• gitlab.ow2.org
• gitlab.ow2.org
• Red Hat Bugzilla Bug

Overview

Affected versions of this package are vulnerable to Uncontrolled Recursion via the parseType method in SignatureReader. An attacker can trigger a StackOverflowError and disrupt class transformation by supplying a crafted class file with a Signature attribute containing deeply nested generic type arguments.

Remediation

Upgrade org.ow2.asm:asm to version 9.11 or higher.

References

• GitLab Commit
• gitlab.ow2.org
• gitlab.ow2.org
• Red Hat Bugzilla Bug

Overview

Affected versions of this package are vulnerable to Denial of Service (DoS) due to improper exception handling by the GzipSource class when parsing a malformed gzip buffer.

This vulnerability can be exploited on the Okio client when handling a crafted GZIP archive.

PoC

val gzBuf: Buffer = Buffer()
    try {
        val gzByteString: ByteString = ("1f8b41ff424242424343ffff").decodeHex()
        gzBuf.write(gzByteString)
        val gz: GzipSource = GzipSource(gzBuf)
        val sinkBuf: Buffer = Buffer()
        gz.read(sinkBuf, 5)
    }
    catch(e: IOException) {
        println("got error: " + e.toString())
    }

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade com.squareup.okio:okio to version 1.17.6, 3.4.0 or higher.

References

• GitHub Commit
• GitHub Commit
• GitHub Issue
• GitHub PR

MPL-2.0 license

EPL-1.0 license

EPL-1.0 license